Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 23:55 and arrives at Tokyo Narita International Airport at 07:40.
The flighttime is about 5h 45m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 785 Km.
There is an 2 hour time difference between Bangkok and Tokyo
The best day to arrive at Bangkok is Sunday and it would be best to avoid Friday, as prices are on average 229.78% higher than on Sunday. (Average prices, based on 630253 datapoints.)
We have a lot more statistics for flights NH 5954 and between Bangkok and Tokyo.