Patrick Mahomes found Travis Kelce for a game-winning touchdown in overtime as the Kansas City Chiefs reached the AFC Championship game for the fourth straight season beating the Buffalo Bills 42-36 on Sunday.

The Bills thought they had wrapped up the victory when quarterback Josh Allen found Gabriel Davis for his record-breaking fourth touchdown to lead 36-33 with 17 seconds left.

But the Chiefs rallied their way down the field led by Mahomes, getting within field-goal range with Harrison Butker sending it to over-time.

Mahomes was heroic, throwing for 177 yards after the two-minute warning, with three lead changes inside the final two minutes, before Butker's tying field goal.

The composed Chiefs QB, who completed 33 of 44 attempts for 378 yards with three touchdowns as well as 69 rushing yards including a TD, found Kelce in the corner to settle the game 4:15 into overtime after they had won the crucial overtime coin flip.

Mecole Hardman, Byron Pringle and Tyreek Hill also scored TDs, the latter restoring the Chiefs' lead in the final two minutes after Allen had combined with Davis.

Allen completed 27 of 37 passes for 329 yards and four touchdowns, while wide receiver Davis had eight catches for 201 yards and four TDs. Running back Devin Singletary scored the Bills' other TD.

The Chiefs will host the Cincinnati Bengals in the AFC Championship Game at Arrowhead on Sunday.