Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 15:55 and arrives at Hanoi Noi Bai International Airport at 18:05.
The flighttime is about 2h 10m. The distance travelled ("as the bird flies"): 593 Km. So the average speed is roughly 274 Km.
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Wednesday, as prices are on average 184.42% higher than on Tuesday. (Average prices, based on 922548 datapoints.)
We have a lot more statistics for flights PG 4285 and between Bangkok and Hanoi.