Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 11:55 and arrives at Hanoi Noi Bai International Airport at 13:55.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 593 Km. So the average speed is roughly 296 Km.
The best day to arrive at Bangkok is Thursday and it would be best to avoid Saturday, as prices are on average 95.34% higher than on Thursday. (Average prices, based on 1274936 datapoints.)
We have a lot more statistics for flights KL 4076 and between Bangkok and Hanoi.