Flight Fukuoka Airport departs from Fukuoka Fukuoka Airport at 07:55 and arrives at Bangkok Don Mueang International Airport at 11:45.
The flighttime is about 5h 50m. The distance travelled ("as the bird flies"): 3406 Km. So the average speed is roughly 584 Km.
There is an 2 hour time difference between Fukuoka and Bangkok