Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 09:35 and arrives at Tokyo Narita International Airport at 18:00.
The flighttime is about 6h 25m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 703 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 Tuesday, as prices are on average 342.71% higher than on Sunday. (Average prices, based on 452241 datapoints.)
We have a lot more statistics for flights NH 848 and between Bangkok and Tokyo.