Flight International Airport departs from Denver International Airport at 15:40 and arrives at Toronto Lester B. Pearson International Airport at 23:43.The flight has a short stop at Chicago.
The flighttime is about 6h 03m. The distance travelled ("as the bird flies"): 2783 Km. So the average speed is roughly 460 Km.
There is an 2 hour time difference between Denver and Toronto