Flight Narita International Airport departs from Tokyo Narita International Airport at 21:15 and arrives at Bangkok Don Mueang International Airport at 02:45.
The flighttime is about 7h 30m. The distance travelled ("as the bird flies"): 4524 Km. So the average speed is roughly 603 Km.
There is an 2 hour time difference between Tokyo and Bangkok
The best day to arrive at Tokyo is Friday and it would be best to avoid Saturday, as prices are on average 326.66% higher than on Friday. (Average prices, based on 122703 datapoints.)
We have a lot more statistics for flights XJ 607 and between Tokyo and Bangkok.