Flight Narita International Airport departs from Tokyo Narita International Airport at 17:25 and arrives at Bangkok Suvarnabhumi Airport at 21:55.
The flighttime is about 6h 30m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 694 Km.
There is an 2 hour time difference between Tokyo and Bangkok
The best day to arrive at Tokyo is Monday and it would be best to avoid Wednesday, as prices are on average 62.59% higher than on Monday. (Average prices, based on 116513 datapoints.)
We have a lot more statistics for flights TG 677 and between Tokyo and Bangkok.
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