Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 14:25 and arrives at Calgary International Airport at 16:55.
The flighttime is about 10h 30m. The distance travelled ("as the bird flies"): 13999 Km. So the average speed is roughly 1333 Km.
There is an 8 hour time difference between Rome and Calgary