Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 22:45 and arrives at Tokyo Narita International Airport at 06:55.
The flighttime is about 6h 10m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 732 Km.
There is an 2 hour time difference between Bangkok and Tokyo
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Wednesday, as prices are on average 66.28% higher than on Tuesday. (Average prices, based on 459820 datapoints.)
We have a lot more statistics for flights TG 682 and between Bangkok and Tokyo.