Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 19:15 and arrives at Buenos Aires Ministro Pistarini International Airport at 04:40.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 10409 Km. So the average speed is roughly 7348 Km.
There is an 8 hour time difference between Rome and Buenos Aires