Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 07:35 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 09:05.
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 Monday and it would be best to avoid Sunday, as prices are on average 187.47% higher than on Monday. (Average prices, based on 4585571 datapoints.)
We have a lot more statistics for flights TG 550 and between Bangkok and Ho Chi Minh City.
IDR