Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 18:30 and arrives at Ho Chi Minh City Tan Son Nhat International Airport at 20:00.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 677 Km. So the average speed is roughly 451 Km.
The best day to arrive at Bangkok is Saturday and it would be best to avoid Sunday, as prices are on average 83.17% higher than on Saturday. (Average prices, based on 245638 datapoints.)
We have a lot more statistics for flights DD 3218 and between Bangkok and Ho Chi Minh City.