Flight Narita International Airport departs from Tokyo Narita International Airport at 17:30 and arrives at Bangkok Suvarnabhumi Airport at 22:15.
The flighttime is about 6h 45m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 668 Km.
There is an 2 hour time difference between Tokyo and Bangkok
The best day to arrive at Tokyo is Sunday and it would be best to avoid Monday, as prices are on average 1361.01% higher than on Sunday. (Average prices, based on 213215 datapoints.)
We have a lot more statistics for flights NH 807 and between Tokyo and Bangkok.