Rajat Patidar returned to captaincy duties after serving two games as an Impact Sub. He won the toss and opted to chase.
Yash Dayal struck in his first over to dismiss Priyansh Arya.
Prabhsimran Singh's attempts to counter-attack Bhuvneshwar Kumar fell through when the seamer shortened his length ever so slightly.
PBKS were four down for 48 in the PowerPlay with the fit-again Josh Hazlewood adding the key wickets of Shreyas Iyer and Josh Inglis in his first spell.
Marcus Stoinis briefly tried to resurrect the PBKS innings with a counter-attack.
The introduction of spin sank PBKS further as Suyash Sharma struck twice in his first over to leave PBKS at 60/7.
As many as four PBKS batters were out bowled as the table-toppers were bowled out for 101 in 14.1 overs.
RCB got off to a brisk start scoring 30 off the first three overs.
Kyle Jamieson bowled a sensational maiden-wicket in which he dismissed Kohli for 12.
Phil Salt hit 21 off Jamieson in the final over of the PowerPlay to effectively seal the game.
Phil Salt scored his fastest IPL 50 and finished with 56* off 27.
Rajat Patidar struck a four and a six to finish off the chase in 10 overs to send RCB to their fourth IPL final.