Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 16:40 and arrives at Da Nang Da Nang International Airport at 18:20.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 846 Km. So the average speed is roughly 508 Km.
The best day to arrive at Bangkok is Thursday and it would be best to avoid Saturday, as prices are on average 82.18% higher than on Thursday. (Average prices, based on 41418 datapoints.)
We have a lot more statistics for flights FD 638 and between Bangkok and Da Nang.