Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 20:26 and arrives at Toronto Lester B. Pearson International Airport at 23:06.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 920 Km. So the average speed is roughly 552 Km.
There is an 1 hour time difference between Chicago and Toronto