A 1m41.697s from Leclerc amid the first runs in the eight-minute SQ3 session proved unassailable, and a second set of laps from both Perez and Verstappen could not topple the Monegasque's searing pace around the Baku circuit.
The Red Bull duo were especially keen to be first out in the final part of qualifying, sitting at the pitlane exit for a few minutes between sessions, and immediately began proceedings with the initial headline efforts.
Perez posted a 1m41.876s to go top, and Verstappen was unable to beat his team-mate's effort having complained that he "lost all the rear in the middle sector".
Leclerc reprised his form from Friday and fired his Ferrari across the line with a 1m41.697s to sit on top of the order, once again throwing down the gauntlet to Red Bull.
Although Perez began to hit back, setting the best middle sector time of the session and threatening to usurp Leclerc, he was unable to make the difference in the final sector and crossed the line 0.15s shy of Leclerc's benchmark.
Attempting to better his own time, Leclerc then gave the Ferrari garage a scare by putting his Ferrari into the barrier at Turn 5, but only damaged his front wing and was able to back it out of the wall - compromising team-mate Carlos Sainz's lap in the process.
Source: Autosport