Flight Narita International Airport departs from Tokyo Narita International Airport at 09:30 and arrives at Bangkok Suvarnabhumi Airport at 22:40.The flight has a short stop at Hong Kong.
The flighttime is about 15h 10m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 297 Km.
There is an 2 hour time difference between Tokyo and Bangkok
The best day to arrive at Tokyo is Saturday and it would be best to avoid Friday, as prices are on average 433.15% higher than on Saturday. (Average prices, based on 119478 datapoints.)
We have a lot more statistics for flights HX 607 and between Tokyo and Bangkok.