Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 14:25 and arrives at Montreal Pierre Elliott Trudeau International Airport at 17:29.
The flighttime is about 2h 04m. The distance travelled ("as the bird flies"): 1575 Km. So the average speed is roughly 762 Km.
There is an 1 hour time difference between Chicago and Montreal