The Bears rallied behind two, fourth-quarter Jay Cutler touchdown passes to turn 17-3 half-time deficit into an 18-17 win.
The Chiefs opened up the lead early thanks to their defense.
With second-and-11 from the Bears own 8-yard line, Cutler was sacked by Jaye Howard and Allen Bailey. Cutler then fumbled the ball in the end zone. Rookie linebacker Ramik Wilson, in his first career start, recovered the ball for the touchdown and a 7-0 Chiefs lead.
After a Bears field goal at the end of the first quarter, the Chiefs added to their lead with the offense in the second.