Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 14:20 and arrives at Moscow Sheremetyevo International Airport at 19:00.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 3133 Km. So the average speed is roughly 854 Km.
There is an 1 hour time difference between Rome and Moscow