Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 07:10 and arrives at Tokyo Narita International Airport at 15:05.
The flighttime is about 5h 55m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 762 Km.
There is an 2 hour time difference between Bangkok and Tokyo
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Thursday, as prices are on average 32.43% higher than on Wednesday. (Average prices, based on 658626 datapoints.)
We have a lot more statistics for flights NH 806 and between Bangkok and Tokyo.
