Flight Don Mueang International Airport departs from Bangkok Don Mueang International Airport at 06:30 and arrives at Chiang Mai Chiang Mai International Airport at 07:40.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 204 Km. So the average speed is roughly 175 Km.
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Saturday, as prices are on average 88.46% higher than on Wednesday. (Average prices, based on 14768687 datapoints.)
We have a lot more statistics for flights DD 120 and between Bangkok and Chiang Mai.