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 Sunday and it would be best to avoid Monday, as prices are on average 153.1% higher than on Sunday. (Average prices, based on 916859 datapoints.)
We have a lot more statistics for flights VN 610 and between Bangkok and Hanoi.