Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 08:05 and arrives at Tokyo Narita International Airport at 16:15.
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 Wednesday and it would be best to avoid Saturday, as prices are on average 138.53% higher than on Wednesday. (Average prices, based on 776243 datapoints.)
We have a lot more statistics for flights JL 708 and between Bangkok and Tokyo.
