Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 21:35 and arrives at Tokyo Narita International Airport at 05:50.
The flighttime is about 6h 15m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 722 Km.
There is an 2 hour time difference between Bangkok and Tokyo
The best day to arrive at Bangkok is Monday and it would be best to avoid Friday, as prices are on average 47.39% higher than on Monday. (Average prices, based on 452040 datapoints.)
We have a lot more statistics for flights NH 850 and between Bangkok and Tokyo.