Cairo Santos' third field goal of the game, a 47-yarder, drew the Bears to within one score at 23-16 with 5:06 to play. But the Ravens answered with a 9-play, 66-yard drive that culminated in Derrick Henry's second 2-yard touchdown run of the game, widening the margin to 30-16 with 2:09 to play.
The loss snapped the Bears' four-game win streak and dropped their record to 4-3.
Williams connected on 25 of 38 passes for 285 yards and a 77.2 passer rating.