Flight O'Hare International Airport departs from Chicago O'Hare International Airport at 13:00 and arrives at Toronto Lester B. Pearson International Airport at 15:43.
The flighttime is about 1h 43m. The distance travelled ("as the bird flies"): 920 Km. So the average speed is roughly 536 Km.
There is an 1 hour time difference between Chicago and Toronto