Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 13:55 and arrives at Bangkok Suvarnabhumi Airport at 05:45.
The flighttime is about 10h 50m. The distance travelled ("as the bird flies"): 9703 Km. So the average speed is roughly 896 Km.
There is an 5 hour time difference between Rome and Bangkok