Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 15:00 and arrives at Miami International Airport at 20:55.
The flighttime is about 11h 55m. The distance travelled ("as the bird flies"): 10330 Km. So the average speed is roughly 867 Km.
There is an 6 hour time difference between Rome and Miami