Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 09:30 and arrives at Athens Athens International Airport Eleftherios Venizelos at 12:30.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 1363 Km. So the average speed is roughly 682 Km.
There is an 1 hour time difference between Rome and Athens