Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 19:05 and arrives at Hanoi Noi Bai International Airport at 21:10.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 593 Km. So the average speed is roughly 285 Km.
The best day to arrive at Bangkok is Thursday and it would be best to avoid Wednesday, as prices are on average 139.39% higher than on Thursday. (Average prices, based on 927818 datapoints.)
We have a lot more statistics for flights PG 4287 and between Bangkok and Hanoi.