Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 02:00 and arrives at Hong Kong Hong Kong International Airport at 05:55.
The flighttime is about 2h 55m. The distance travelled ("as the bird flies"): 1487 Km. So the average speed is roughly 510 Km.
There is an 1 hour time difference between Bangkok and Hong Kong
The best day to arrive at Bangkok is Monday and it would be best to avoid Saturday, as prices are on average 470.04% higher than on Monday. (Average prices, based on 1512005 datapoints.)
We have a lot more statistics for flights HX 780 and between Bangkok and Hong Kong.
THB