Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 01:45 and arrives at Fukuoka Fukuoka Airport at 08:55.
The flighttime is about 5h 10m. The distance travelled ("as the bird flies"): 3406 Km. So the average speed is roughly 659 Km.
There is an 2 hour time difference between Bangkok and Fukuoka