Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 11:30 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 13:00.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 660 Km. So the average speed is roughly 440 Km.
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Friday, as prices are on average 37.35% higher than on Tuesday. (Average prices, based on 3510609 datapoints.)
We have a lot more statistics for flights VJ 802 and between Bangkok and Ho Chi Minh City.