KKR had already dispatched of the Sunrisers with an eight-wicket victory in the first qualifier on Tuesday, and pulled off another superb performance to clinch the IPL for a third time.
Mitchell Starc stifled SRH from the start, taking Abhishek Sharma for two runs off five balls before Rahmanullah Gurbaz caught Travis Head for a duck.
In a stellar bowling display, Starc eventually finished with 2-14, while Andre Russell chipped in with a 3-19 late on.
The Sunrisers failed to gain any momentum on a low-scoring day, with Pat Cummins the top scorer with 24 off 19, as SRH finished with a measly 113 all out in the 19th over.
Despite Sunil Narine's early exit, SRH failed to give themselves any hope as Venkatesh Iyer came on to plunder 52 not out from 26 balls, including three boundaries, adding to Gurbaz's 39.
Shreyas Iyer then came on to help KKR over the line with six runs, seeing the win out for his team with 57 balls remaining.
Data Debrief: KKR bowlers come out on top
Russell has taken 18 wickets in the IPL this year, the most he has taken in any edition, going past 17 from 2022.
The Sunrisers registered the lowest-ever run total in an IPL final (batting first or second), beating the previous record of 125.
SRH lost 29 wickets during the powerplay overs in the IPL in 2024, the most by any team in this phase this season; it is also the second most wickets they have lost during the powerplay in a single IPL season (31 in 2013).
The hosts won the toss and posted a formidable 182-6 from their 20 overs thanks to 83* from Virat Kohli and 33 from Cameron Green.
Andre Russell was the pick of the KKR bowlers with 2-29 from his four overs while Harshit Rana took 2-39 and Narine took 1-40.
The Knight Riders then sprinted to their target, reaching 186-3 with 19 balls to spare.
Venkatesh Iyer led the way with a 30-ball 50 including three fours and four sixes while Narine, who opened the batting, set the tone for the innings with 47 off just 22 balls including two fours and five sixes.
Kolkata Knight Riders 186 for 3 (Venkatesh Iyer 50, Sunil Narine 47) beat Royal Challengers Bengaluru 182 for 6 (Virat Kohli 83*, Andre Russell 2-29, Rana 2-39) by seven wickets
A delayed start to the contest meant it was limited to 16 overs per side, and KKR made it to 157-7 with Venkatesh Iyer producing a quick-hitting 42 runs from 21 balls, as Jasprit Bumrah (2-39) and Piyush Chawla (2-28) both made an impact with the ball.
While Sunil Narine went without scoring, Andre Russell contributed a 14-ball 24 toward the backend of the KKR innings, including two fours and two sixes.
The Indians looked likely to chase down their victory target when they reached 65-0 in the early stages, as they looked to improve on a fine 7-3 record at KKR's Eden Gardens.
But the wicket of Ishan Kishan in the seventh over sparked a rapid collapse, with Mumbai – already eliminated from the competition – quickly falling to 92-5 and ultimately losing by 18 runs.
Russell returned to grab 2-34 from three overs, sharing the wickets with Harshit Rana (2-34), Varun Chakaravarthy (2-17) and Narine, who had 1-21 from his three overs.
KKR remain top of the standings. As well as being the first team to seal their progress, they look good to secure a crucial top-two finish which would give them two chances to reach the final. They now have 18 points, two clear of Rajasthan Royals, who play Chennai Super Kings in one of two games due to take place on Sunday.
Data Debrief: Bumrah eyeing Purple Cap
While this was the latest setback in a highly disappointing season for Mumbai, who are second-bottom of the standings, Bumrah has been a prolific threat.
He took another two key wickets in this one, removing KKR dangerman Sunil Narine for a golden duck and halting a charge from Rinku Singh (20 from 12) in the final over.
That took India bowler Bumrah's season tally to 20, putting him level with Punjab Kings' Harshal Patel at the top of the Purple Cap standings.
The final figures could have been even better for Bumrah, who was frustrated to be hit for six by Ramandeep Singh (17 from 8) in the final ball of the KKR innings and earlier had an lbw decision against Nitish Rana (33) overturned on review.
However, a difficult period of form continued for Bumrah's team-mate Rohit Sharma in his team's unsuccessful run chase.
The opener came into the match with scores of 6, 8, 4, 11 and 4 in his last five innings and he was not much better here, struggling to 19 from 24 before falling to the superb Varun Chakaravarthy, who posted economical figures of 2-17 from four overs. That was quite the contrast to partner Kishan, who smashed 40 from 22.
