Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 02:15 and arrives at Nagoya Chubu Centrair International Airport at 09:40.
The flighttime is about 5h 25m. The distance travelled ("as the bird flies"): 4120 Km. So the average speed is roughly 761 Km.
There is an 2 hour time difference between Bangkok and Nagoya