Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 12:30 and arrives at Moscow Sheremetyevo International Airport at 17:30.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 3133 Km. So the average speed is roughly 783 Km.
There is an 1 hour time difference between Rome and Moscow