Flight Leonardo da Vinci–Fiumicino Airport departs from Rome Leonardo da Vinci–Fiumicino Airport at 15:15 and arrives at Bangkok Suvarnabhumi Airport at 07:40.
The flighttime is about 10h 25m. The distance travelled ("as the bird flies"): 9703 Km. So the average speed is roughly 931 Km.
There is an 6 hour time difference between Rome and Bangkok