Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 22:15 and arrives at Moscow Sheremetyevo International Airport at 04:30.
The flighttime is about 10h 15m. The distance travelled ("as the bird flies"): 6765 Km. So the average speed is roughly 660 Km.
There is an 4 hour time difference between Bangkok and Moscow