Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 11:55 and arrives at Tokyo Narita International Airport at 20:00.
The flighttime is about 6h 05m. The distance travelled ("as the bird flies"): 4524 Km. So the average speed is roughly 744 Km.
There is an 2 hour time difference between Bangkok and Tokyo
The best day to arrive at Bangkok is Saturday and it would be best to avoid Monday, as prices are on average 42.73% higher than on Saturday. (Average prices, based on 113366 datapoints.)
We have a lot more statistics for flights XJ 606 and between Bangkok and Tokyo.