Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 23:30 and arrives at Tokyo Narita International Airport at 08:00.
The flighttime is about 6h 30m. The distance travelled ("as the bird flies"): 4524 Km. So the average speed is roughly 696 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 Wednesday, as prices are on average 109.18% higher than on Saturday. (Average prices, based on 201802 datapoints.)
We have a lot more statistics for flights XJ 600 and between Bangkok and Tokyo.
