Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 13:00 and arrives at Hanoi Noi Bai International Airport at 15:00.
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 Saturday and it would be best to avoid Tuesday, as prices are on average 496.16% higher than on Saturday. (Average prices, based on 1274571 datapoints.)
We have a lot more statistics for flights ET 608 and between Bangkok and Hanoi.