Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 23:45 and arrives at Tokyo Narita International Airport at 08:05.
The flighttime is about 6h 20m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 712 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 Sunday, as prices are on average 83.86% higher than on Wednesday. (Average prices, based on 451137 datapoints.)
We have a lot more statistics for flights NQ2 and between Bangkok and Tokyo.