Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 13:00 and arrives at Tokyo Narita International Airport at 21:10.
The flighttime is about 6h 10m. The distance travelled ("as the bird flies"): 4511 Km. So the average speed is roughly 732 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 Thursday, as prices are on average 134.67% higher than on Sunday. (Average prices, based on 469133 datapoints.)
We have a lot more statistics for flights NH 5966 and between Bangkok and Tokyo.
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