Allen, who completed 27 of 40 attempts for 329 yards with no interceptions, found Dawson Knox for the game-winning touchdown with 1:04 left in the fourth quarter at Arrowhead Stadium.
The Bills sealed the win when Von Miller broke a double team to apply pressure on Chiefs QB Patrick Mahomes whose pass for Skyy Moore was picked by cornerback Taron Johnson with 0:41 remaining.
It ended a seesawing contest that had four lead changes, was tied at every change and was within one score throughout, with the AFC East-leading Bills moving ahead of the AFC West-leading Chiefs who fall to 4-2.
Mahomes made 25 of 40 attempts for 338 yards with two touchdowns and two interceptions, with Bills rookie Kaiir Elam picking off a redzone pass in the first quarter. Chiefs wide receiver Travis Kelce made franchise history by reaching the record for consecutive games with a reception (132), finishing with eight receptions for 108 yards but no TDs.
JuJu Smith-Schuster, who had five receptions for 113 yards, spun past two defenders after receiving a Mahomes pass for the opening TD, before Allen found Gabe Davis to reply before half-time, with Harrison Butker's franchise-record 62-yard field goal tying it up at half-time.
Stefon Diggs, who had 10 receptions for 148 yards, added his sixth receiving touchdown this season when Allen found him for 17-yard score but the Chiefs responded again as Mahomes punched a pass to Mecole Hardman.
Butker put the Chiefs up 20-17 in the fourth quarter, but Allen found Knox in the endzone to flip the script.
Rams respond as Anderson thrown out by Panthers
The Los Angeles Rams ground their way to a 24-10 victory over the Carolina Panthers to snap their two-game skid and move to 3-3.
Scores were locked at 10-10 with 16 seconds remaining in the third quarter when wide receiver Ben Skowronek swept down the outside and into the endzone for his career-first TD.
Matthew Stafford shook off the Rams' offensive issues to complete 26 of 33 passes for 253 yards and one touchdown for Allen Robinson, while Darrell Henderson rushed a fourth-quarter TD to pad the win.
Amid the Panthers' own offensive struggles, interim coach Steve Wilks threw Robbie Anderson out of the game after a heated argument with position coach Joe Dailey.
The Chiefs ended a 50-year wait for a title thanks to a thrilling 31-20 victory over the San Francisco 49ers, having trailed by 10 points during the fourth quarter of the game in Miami.
It marked the crowning glory in the career of popular head coach Reid, who finally won a Super Bowl ring for the first time, and he clearly has little intention of it being his only success.
Speaking in front of fans, Reid declared: "Next year we're coming right back here. One more time, baby. One more time."
The trophy for the AFC champion is named after Lamar Hunt, the father of franchise owner Clark Hunt.
Lamar Hunt died in 2006 and superstar quarterback Patrick Mahomes, who gleefully chugged beers on the bus during the journey, said that was part of the inspiration for the Chiefs.
"When I became the starter, the first thing I wanted to do was bring the Lamar Hunt Trophy back to Kansas City, back to this organisation," said Mahomes, who was named MVP for the game.
"And the second most important thing I wanted to do was bring the Vince Lombardi Trophy to the best coach in the National Football League."
Among the celebrations and shenanigans, Travis Kelce adorned a Louis Vuitton coat reportedly worth $20,000, as well as a custom-made WWE title belt strapped around his waist.
Stepping up to the microphone, Kelce bellowed out, "Can you dig it?" and screamed, "You've got to fight for your right to party" in reference to team's anthem by The Beastie Boys.
Hollywood actor and Chiefs fan Paul Rudd also got in on in the act, sharing what the result meant to him while speaking to the NFL Network.
"You get the feeling that no one else in the league is paying attention. It's a small market. Only Chiefs fans know about it," Rudd said.
"It's the first time I've been able to say to my son, 'You can be proud of this team, you don't have to wait until next year'. It's pure elation.
"Every single year since he was seven, he cries at the end of the season. This year, he cried more than ever, but they were happy tears."
The first Pro Bowlers of the 2021 season were revealed on billboards in Las Vegas, which will host the annual NFL all-star game on 6 February at Allegiant Stadium.
The other confirmed players to feature are Aaron Donald (Los Angeles Rams), Cooper Kupp (Los Angeles Rams), Jonathan Taylor (Indianapolis Colts) and Travis Kelce (Kansas City Chiefs).
Brady will overtake Peyton Manning, Tony Gonzalez, Bruce Matthews and Merlin Olsen, who all featured in 14 Pro Bowls.
The legendary quarterback has guided the Tampa Bay Buccaneers to a 10-4 record and first place in the NFC South, with just one more victory needed to secure the division title. Brady currently boasts the best 2021 numbers in most major passing categories, including yards (4,348), attempts (602), completions (404) and touchdown passes (36).
The 44-year-old has won more Super Bowls than any other player in history (seven) and also holds the record for most Super Bowl MVP awards (five).
The full reveal of the AFC and NFC teams for this year's Pro Bowl will take place on Wednesday.
There had been plenty of talk in the lead-up about the success Bengals quarterback Joe Burrow has enjoyed against the Chiefs, sporting a 3-0 record against Mahomes' crew heading into the contest. It had led to Bengals fans calling the Chiefs' home ground 'Burrowhead', which clearly irked Kansas City players.
Despite playing with a high ankle sprain, Mahomes found a way to get one over the number one overall pick from the 2020 NFL Draft, completing 29 of his 43 passes for 326 yards, two touchdowns and no interceptions.
He also made the game-deciding play when he scrambled on his bad ankle with 15 seconds left in regulation, converting a third-and-four and making it to the sideline to stop the clock. After crossing the sideline, he was hit late by Joseph Ossai, resulting in a 15-yard penalty to put Chiefs kicker Harrison Butker into range for the game-winner.
Burrow put together a respectable stat line, completing 26 of his 41 passes for 270 yards and a touchdown, but he threw two crucial interceptions.
In the immediate aftermath during his on-field interview, Mahomes was interrupted by his future Hall of Fame tight end with a very clear message.
"Burrowhead my a**," he said. "It's Mahomes' house!"
Offensive lineman Orlando Brown Jr also chimed in about Mahomes: "World's greatest! Give him his respect! Stamp him!"
Mahomes was far more under control during his interview, but also referenced his displeasure about the Burrowhead nickname.
"First off I want to thank God, man," he said. "He healed my body this week and gave me the strength to be out here.
"As for this team, man, we play together. I said it from the beginning, when we were in the locker room, I said 'we've got to be together' – and this team stepped up against a great football team.
"We showed this place that it's Arrowhead, it's not 'Burrowhead' out here."
When asked about the Chiefs' impending Super Bowl date against the Philadelphia Eagles, Mahomes gave plenty of respect to the NFC Champions.
"They're a great football team, I've watched them all year long," he said. "Great quarterback, and a great entire team. It's going to be a great challenge for us, but I'm going to celebrate this one first.
"I'm going to get back with my team – I don't think we have any cigars – but we'll be ready to go at the Super Bowl."
The 30-year-old tight end has committed to the Chiefs for the next six seasons, a team announcement said.
The Chiefs did not immediately provide financial details of Kelce's extension to his previous contract, which had two years left to run.
Initially reports of Kelce agreeing fresh terms with the Chiefs had emerged through NFL Network on Thursday.
Kelce helped the Chiefs win the Super Bowl last season and his opposite number in that game, George Kittle, secured a record-breaking pact on Thursday with the San Francisco 49ers, said to be worth $75million over five years.
The Chiefs star's new contract, if the reported details are correct, will see him earn $57million for the additional four years.
The five-time Pro Bowler was selected by Kansas City in the third round of the 2013 draft.
Kelce was an instrumental figure for the Patrick Mahomes-led champions in the 2019 season, although he was even more masterful in the previous campaign.
He had 103 receptions for 1,336 yards and 10 touchdowns in 2018, building an effective partnership with MVP Mahomes.
In July, the Chiefs announced quarterback Mahomes was also staying with the franchise for the long term, the 24-year-old committing to a 10-year deal.
Kelce - missing his first game of the season - is joined by Nick Bolton, Lucas Niang, Harrison Butker and Tommy Townsend in being ruled out, while coaches Mike Kafka, Greg Lewis and Corey Matthaei are also under coronavirus protocols.
The tight end had been pre-emptively activated in the hope that he would be cleared to play, but he must now sit the match out as the Chiefs chase the AFC West title - which they would clinch with victory over the Steelers if the Los Angeles Chargers also fail to win - without him.
The Chiefs will feel Kelce's absence particularly keenly after his career-best performance in the 34-28 victory over the Chargers last time out, catching 10 passes for 191 yards and scoring the game-winning touchdown.
He is set to be replaced in the side by Blake Bell, who has just returned from the COVID list himself.
Kelce was slated to earn about $7.5 million in 2022, the first season of a four-year, $57 million extension he signed in August 2020 that contains $20.75 million in guarantees. Moving some of that money towards the front of the deal gives the Chiefs a little more salary cap flexibility in future years.
The 32-year-old Kelce was named to a seventh straight Pro Bowl in 2021 after recording 92 catches for 1,125 yards and nine touchdowns in 16 games.
Kelce’s six consecutive seasons with at least 80 receptions and 1,000 receiving yards is the longest streak by a tight end in NFL history and the longest active run of any player.
Only five players have produced those numbers in seven or more straight seasons. Jerry Rice, Marvin Harrison and Torry Holt each did so in eight consecutive seasons, while Tim Brown and Brandon Marshall had seven-year streaks.
Kelce has also been remarkably durable throughout his nine-year NFL career, having missed just three games over the past eight seasons.
Kelce helped the Chiefs win the Super Bowl last season and his opposite number in that game, George Kittle, has secured a record-breaking pact with the San Francisco 49ers.
The Chiefs star's new contract does not quite match Kittle's but represents a boost for a player with two years remaining on his previous deal.
NFL Network's Ian Rapoport says Kelce is set to receive $57million across four years in his third NFL contract.
The five-time Pro Bowler has spent his entire career to date with Kansas City, who selected him in the third round of the 2013 draft.
Kelce was a key piece for the Patrick Mahomes-led champions in 2019, although the best season of his NFL career came the previous year.
He had 103 receptions for 1,336 yards and 10 touchdowns in 2018, building an effective partnership with MVP Mahomes.
The Chiefs quarterback has also committed his future to the franchise since their Super Bowl success, agreeing an unprecedented 10-year deal.
Kelce hyperextended his knee during Tuesday's practice, putting his status in doubt for Week 1.
Chiefs coach Andy Reid did not provide any details about how the injury occurred during Kansas City's final practice ahead of the season opener.
Kelce has not missed a game to injury since his 2013 rookie season and has been indispensable to Kansas City's offense as Patrick Mahomes' favourite target.
Near the goal line, he is Mahomes' go-to receiver, as no player was targeted more in the red zone last season than Kelce with 30.
Widely considered the top tight end in the NFL, the 33-year-old caught a career-high 110 passes for 1,338 yards in 2022, his seventh straight season eclipsing 1,000 yards receiving. He also caught a career-best 12 touchdowns last season, giving him 69 in his career.
In Kansas City's march to the Super Bowl, he caught 27 passes for 257 yards with four touchdowns in three playoff games. He had six receptions for 81 yards with a TD in the Super Bowl.
Should he be forced to sit out, that could spell trouble for Kansas City given his familiarity with Mahomes and the fact the Chiefs are introducing several new receivers this year.
Noah Gray, who is listed as Kelce's backup on the depth chart, had 28 catches for 299 yards with a TD for the Chiefs last season.
The Chiefs are hopeful of having Kadarius Toney available for the opener after the wide receiver missed nearly all of training camp with a torn meniscus in his knee.
The Kansas City defense, however, will likely be without Chris Jones as the All-Pro defensive tackle has been holding out while trying to get a long-term contract.
Mahomes had sustained a high ankle sprain in the Divisional round victory over the Jacksonville Jaguars but was determined not to miss the opportunity to gain revenge following last year's loss against the Bengals at the same stage.
In that reverse, Mahomes followed an outstanding first half with an uncharacteristically shambolic second that cost the Chiefs.
However, on Sunday, as the game wore on and the temperature dropped, Mahomes showed signs of his injury affecting him but refused to relent, finishing with 29-of-43 passing for 326 yards and two touchdowns, along with a vital late run.
Mahomes was largely able to stay clean in the first half while Joe Burrow took some punishment, but the Chiefs' sole TD pass found Travis Kelce on fourth-and-one.
Memories of last year's loss might have come to mind as the Bengals came out stronger in the third quarter and Tee Higgins sensationally reeled in a pinpoint Burrow TD pass down the sideline.
A hobbling Mahomes battled on and connected with Marquez Valdes-Scantling for a scrambling score, only for Burrow to find Ja'Marr Chase deep on fourth-and-six to set up Samaje Perine to run it in.
With the scores tied, both QBs struggled to get the job done as overtime neared, but Chris Jones sacked Burrow to force a Bengals punt, with Skyy Moore's 27-yard return keeping the Chiefs alive.
When Mahomes – understandably reluctant to run the ball until that stage – made up five yards and was shoved by Joseph Ossai after running out of bounds, a 15-yard penalty left Harrison Butker with the 45-yard game-winning field goal to set up a Super Bowl meeting with the Philadelphia Eagles.
Kelce keeping fine company
Restricted by his injury, Mahomes needed help from his receivers and got it. He completed passes to 10 team-mates, but Kelce was unsurprisingly his primary target, completing seven of nine attempts for a TD.
That was Kelce's 15th receiving TD in the postseason, drawing him level with fellow tight end Rob Gronkowski and now trailing only wide receiver Jerry Rice (22) for all-time postseason scores.
Burrow takes a beating
This was the first time Burrow had lost to Mahomes, with the Chiefs clearly irked by talk of the Bengals QB's dominance in this matchup. The Chiefs got to Burrow time and again early on, with four sacks before halftime.
Coming into the game, Burrow was 14-1 this season when sacked four times or fewer but 0-3 when sacked five times or more. That fifth and final sack from Jones proved so pivotal.
Mahomes starred in the AFC Championship Game at Arrowhead Stadium on Sunday, throwing three touchdowns and rushing for a sensational 27-yard score to help the Chiefs clinch a 35-24 victory.
Kansas City will now face either the San Francisco 49ers or the Green Bay Packers in their first Super Bowl appearance in 50 years and tight end Kelce was in the mood to celebrate.
The 30-year-old interrupted Mahomes' post-game interview with broadcaster CBS to boisterously praise the reigning NFL MVP.
"This is the best quarterback in the National Football League right here, baby," Kelce said.
"And he shows it every time! Humble as can be. I f****** love you!"
Mahomes went 23 of 35 for 294 passing yards as he became the first player in the team's history to record multiple passing touchdowns and a rushing touchdown in a postseason game.
The two-time Pro Bowler called the victory a vindication of the Chiefs' willingness to succeed in any manner necessary.
"I knew going into the NFL I was going to do whatever it took to just win games," Mahomes said.
"You can see that in every single player on this team. We don't care if we win 10-7 or 35-24. We're just going to go out there and find a way to win the football game, whatever it takes."
Players from Super Bowl champions the Kansas City Chiefs and the Houston Texans linked arms prior to Thursday's contest, which the Chiefs won 34-20 at Arrowhead Stadium.
The Chiefs are among the teams letting supporters into their arena during the coronavirus pandemic and, despite fewer than a quarter of the seats being filled, boos could be heard from pockets of the stands.
"The moment of unity I personally thought was good," Texans defensive end Watt told NFL Media.
"I mean the booing during that moment was unfortunate. I don't fully understand that. There was no flag involved. There was nothing involved other than two teams coming together to show unity."
The NFL has opted to alter its stance on protests this season, with end zones to bear the words "End Racism" and "It Takes All of Us", while players can display the names of victims of social injustice on their safety helmets.
Houston players stayed in the locker room during the national anthem, while the Chiefs' Alex Okafor took a knee.
Chiefs tight end Travis Kelce said: "[We wanted to] let everyone know that we had their back.
"You can go ahead and whatever you feel is the right decision in your heart, you have your brother's back and you have your brother's support on this team.
"And we made sure that everybody was comfortable in that area and they weren't gonna get backlash from anybody on this team for doing that.
"And I thought it was a great show of unity amongst both of us, the Chiefs and the Texans.''
Texans coach Bill O'Brien stated he did not hear any booing and pondered whether the jeers may have actually been for his team as the opposing side.
"I thought that that was a nice thing to do, so I'm not sure why they would boo that," O'Brien said.
"Maybe they were just booing us because we had just come on the field as the visiting team. But yeah, I thought that that was a nice gesture."
Chiefs coach Andy Reid also said he did not hear the boos and added: "I thought that was kind of a neat deal, both sides coming together for a cause and the story was told there.
"We can all learn from this, and really it's just to make us all better, even a stronger country than we already are. We have a chance to just be completely unstoppable when all hands join together and that's a beautiful thing."
The pair will become the first brothers to face off in NFL's biggest match, with both aiming to land their second ring, when the Eagles take on the Kansas City Chiefs in Arizona.
Mother Donna and father Ed Kelce will be in attendance at State Farm Stadium for the family affair, and older brother Jason would rather be in his position than theirs.
"I think it's always stressful for the people watching," he told reporters. "I think that's probably more [stressful]... not even just parents but also the coaches and fans.
"When you don't have control on the field of what's happening, I think that's a stressful situation.
"I feel like when you're playing, there's a sense of control in the outcome and you can have a difference in it yourself. So it's a little bit less stressful.
"I would imagine my parents would probably be a little stressed out. I think they are every time they're watching a game."
Jason won the Super Bowl with the Eagles in 2017, while Travis – two years younger than his brother – did so with the Chiefs in 2019.
While rivals on the field, however, Jason explained the pair remain as strong as ever off it, even if the dynamic of their relationship has changed over the years.
"I grew up the older brother, so I was then much more mature, which I don't know if that's a good word to describe me, but I was more mature than him," he said.
"I think when you get to a certain point being brothers, it becomes more of a peer relationship.
"I'm no longer telling him what to do or showing them the ropes or trying to offer guidance as an older brother.
"Now it's more just a friend and a different type of brother, right? He does the same for me. I get advice from him now, which growing up didn't happen too often.
"I think the dynamic has changed a little bit in that regard. We get to genuinely just enjoy each other's personalities and who we are as individuals, and I think that makes it fun."
Needing a field goal to extend the game or a touchdown to win, Chiefs’ quarterback Patrick Mahomes orchestrated the match-winning drive to end the game with a touchdown pass to Mecole Hardman Jr.
The 49ers were leading by three in overtime after they opted for a field goal to go ahead 22-19, but were unable to get the decisive stop.
It was the second time in NFL history a Super Bowl went to overtime and the first post-season game decided under the league’s new overtime rules.
Mahomes finished with 333 throwing yards, two touchdowns and 66 running yards, while 49ers quarterback Brock Purdy threw for 255 yards with one touchdown.
The only points in the first quarter came through kicker Jake Moody, who made Super Bowl history with the longest made field goal at 55 yards.
Disaster struck 49ers’ linebacker Dre Greenlaw early in the second quarter when he went down with a suspected Achilles injury while running onto the field and was immediately ruled out of the game.
But not long after, a special trick-play led to the first touchdown of the game, with Purdy passing across field to wide-receiver Jauan Jennings before he threw a pass to Christian McCaffrey who ran through to the endzone untouched.
The 49ers restricted Travis Kelce to just one touch for one yard in the first half and sacked Mahomes twice, with the 49ers ahead 10-3 at halftime.
Alicia Keys, Lil John and Ludacris joined Usher during the half-time performance, while Taylor Swift was among celebrities including Blake Lively, Lady Gaga, Beyonce and Jay Z watching from the stands.
As play resumed, Chiefs kicker Harrison Butker broke Moody’s Super Bowl record with a 57-yard field goal before a fumble error gave the Chiefs a huge chance for their first touchdown.
Mahomes found wide-receiver Marquez Valdes-Scantling with a 16-yard touchdown pass to take the lead for the first time in the game late in the third quarter.
However the 49ers hit back – with Purdy finding Jennings this time to score his own touchdown – however the bonus point was blocked, giving the 49ers a three-point lead with 11 minutes left.
A field goal to Butker tied the game once again, before Moody struck back to give the 49ers the lead again with less than two minutes left.
However, Butker finished regulation time with a field goal with six seconds left to tie the game 19-19.
Tight end Kelce helped the Chiefs to their second straight Super Bowl triumph earlier this year.
The 34-year-old has spent much of the offseason on tour with his girlfriend Taylor Swift, even appearing in some of the pop superstar's shows in Europe.
However, now back at training camp, Kelce is not planning on slowing down any time soon.
"Last year was pretty taxing on my body," Kelce said after Saturday's session at Missouri Western State University.
"I've had more snaps than a lot of guys if not everybody in the NFL over the past five, six years, and I'm very prideful of that, but I know it has taken a toll on my body.
"So it's just making sure that my body's getting that rest and that ability to train harder and be able to withstand an entire 17-to-20-game season.
"This is my sanctuary. Everybody may say that is pretty gruelling, but I enjoy it. There's something about this place to get you ready every single year, and I'm not going to lie, I got pretty excited as the time started counting down to get out here and get this thing rolling.
"This is where it all starts. You can say it starts in the offseason, and yeah, you want to get that foundation set in the offseason of the leadership and the mentality and things like that.
"But at the end of the day, this is where you really find out what the team is made of, how you sharpen the iron, how your guys practice your practice habits, the attention to detail, and nobody does it better than coach [Andy] Reid."
The Kansas City Chiefs star is a three-time Super Bowl champion, defeating the San Francisco 49ers for his most recent crown last season.
With preparations already underway for the 2024 campaign, the 34-year-old – a nine-time Pro Bowler – understandably has the future on his mind.
Yet Kelce has no doubts over his ambitions this year, signalling that there is still life in his ageing career with the Chiefs.
"I love coming to work every single day and doing this, so I am going to do it until the wheels fall off and hopefully that doesn't happen anytime soon," Kelce said after the Chiefs' practice on Tuesday.
"I can't put a time frame on it, man. I know that there are opportunities outside of football for me and I think you've got to keep in perspective that I'm still a little kid when I come into this building.
"I know I'm 34 years old, about to be 35, but I have a love to do this right here in the middle of the heat in June."
Kelce's relationship with global superstar singer Taylor Swift has drawn unprecedented media attention off the field, while he has shown interest in acting after his career ends.
Hosting a podcast with his brother Jason, another former NFL star, Kelce has multiple options when he chooses to call time on his playing days.
"I do take the offseason to get away and kind of recharge, but at the same time, I'm a football player," Kelce added.
"I love playing in the NFL and this will always be my main focus, but outside of that, football ends for everybody, so kind of dipping your toes in the water and seeing what you like in different areas in different career fields, I think the offseason is the best chance you can get."
As for on the field, the Chiefs added two tight ends this year with veteran Irv Smith Jr. and draft pick Jared Wiley.
Noah Gray, their fourth-leading receiver last season, is also back, suggesting Kansas coach Andy Reid is keen to manage Kelce's workload.
"It's my job to make sure that Coach Reid has full confidence in me whenever he needs me out on that field or whenever I'm out on that field," Kelce said.
"As much as I want to be out there every single play, I understand that it's for the better of the team when I'm not.
"I'm more comfortable with that right now because of the guys that we have in the room. We've got a lot of great tight ends in the building and it's fun seeing them have success as well."
Patrick Mahomes found Kelce for a 17-yard touchdown with 31 seconds remaining to earn the Chiefs the victory, after the Chargers had re-claimed the lead when Josh Palmer scored his second TD with 1:51 left. There were six lead changes across the game, including three in the final quarter.
Chargers quarterback Justin Herbert's desperate deep pass for Keenan Allen was intercepted by Nick Bolton on a deflection with 26 seconds remaining to end the game.
Kelce finished with three touchdowns on six receptions for 115 yards, with Mahomes throwing three TDs on 20-of-34 passing for 327 yards. The win was the Chiefs' fourth in a row and moved them to 8-2 in top spot in the AFC West, with the Chargers second at 5-5.
Herbert completed 23 of 30 passes for 280 yards with two touchdowns and an interception, while he was sacked a career-high five times. The Chargers had allowed the fewest sacks in the NFL through 10 games coming in, at 13.
The Chargers led 20-13 at half-time, with Herbert threading a 50-yard first-quarter pass for Palmer. Kelce put the Chiefs ahead early in the second quarter, capping a seven-play 75-yard drive, before Austin Ekeler restored the hosts' lead.
The Chiefs went ahead again early in the fourth when Mahomes' 32-yard pass found Kelce.
Chargers veteran Allen was guilty of a fumble but pulled off a great catch in their next drive on a 46-yard sideline shot, leading to Palmer's second TD. But the Chiefs had the last laugh, with Kelce bursting through for the decisive score on a six-play 75-yard drive.
The Chiefs claimed their first title in 50 years on Sunday, Mahomes inspiring a stunning fourth-quarter turnaround to defeat the San Francisco 49ers 31-20 in Miami.
Kansas City trailed by 10 points after three quarters, but Mahomes, who had already rushed for one touchdown, threw for two scores as Andy Reid's team roared back.
Along with the usual Super Bowl rings, the Chiefs were rewarded with a custom WWE belt from wrestling executive Paul 'Triple H' Levesque.
And as the team gathered for Wednesday's celebratory parade in Kansas City, a Twitter post showed tight end Kelce wearing the belt.
The celebrations had seemingly already had an impact on Mahomes, however.
The quarterback, who has previously been mocked by team-mates for a voice described by head coach Reid as "froggish", revealed on Twitter that he was struggling ahead of the event.
He wrote: "Im go ahead and warn y'all my voice is almost gone and i already don't have a lot!"
Mahomes became the first player in playoff history to throw for 300-plus yards, rush for 50-plus yards and throw five touchdowns in a game as the Chiefs erased a 24-0 deficit to beat the Texans 51-31 and move through to the AFC championship on Sunday.
The Chiefs quarterback was at the forefront of the biggest comeback in franchise history – Mahomes finishing 23 of 35 for 321 yards and five touchdowns, while he rushed for 53 on seven carries.
"Not anybody in Kansas City, I'll tell you that right now," Kelce told the NFL Network when asked if some forgot how good Mahomes was due to Lamar Jackson's exploits with the Baltimore Ravens this season. "Pat Mahomes is the best quarterback in the league, and he proved it today."
The Chiefs reeled off 41 successive points to dig themselves out of a big hole and top the visiting Texans in Kansas City, becoming the first team in history to win a postseason game by at least 20 points after trailing by at least 20 points.
Standing in the way of the Chiefs and a Super Bowl berth are the giant-slaying Tennessee Titans.
"Obviously we didn't start the way we wanted to, but all we were preaching -- offense, defense and special teams -- is let's do something special," Mahomes said. "Everybody's already counting us out, let's keep fighting and just go one play at a time, and we found a way. Obviously, this is a huge win and now we've got the AFC championship game at home."
Chiefs tight end Kelce, who had three TDs, added: "I've never been a part of a team like this, either, so it was, I guess, a perfect match there, after we went down.
"Just leaned on each other, circled the wagons, get a little bit tighter when things get a little rough and lean on your brother. And when in doubt make plays for your guy back there. 1-5 [Mahomes] got us going, 17 was the one that really sparked us there on the special teams and, you know what, this defense played their tails off all game."
Kelce and star quarterback Mahomes combined for a 34-yard touchdown to lift the AFC West-leading Chiefs (10-4) past the Chargers (9-6) in the additional period for their seventh straight victory.
Mahomes – who finished 31-of-47 passing for 410 yards, three touchdowns and an interception – took his tally to 152 touchdowns in 60 NFL games, the former MVP becoming the fastest player to reach 150 combined rushing and passing TDs after eclipsing Hall of Famer Dan Marino (61 games).
The Chiefs rallied in Los Angeles, where the Chargers were fuelled by Justin Herbert – who threw a touchdown pass and ran for another score to put the hosts 14-10 ahead at half-time.
After Kansas City's Harrison Butker's field-goal made it a one-point game in the third quarter, the two teams traded touchdowns in a wild fourth period.
The Chargers led 21-13 and 28-21, but the Chiefs responded on both occasions – Mahomes throwing touchdowns passes to Tyreek Hill and Kelce as Kansas City forced overtime.
That Mahomes-Kelce combination proved decisive with less than nine minutes left on the clock in OT after the latter weaved his way through the Chargers' defence to spark wild celebrations.
Hill and Kelce became the first wide receiver/tight end duo in NFL history to each have at least 10 receptions for 140 yards and a touchdown in the same game, per Stats Perform.
