Flight Chiang Mai International Airport departs from Chiang Mai Chiang Mai International Airport at 17:00 and arrives at Bangkok Don Mueang International Airport at 18:15.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 204 Km. So the average speed is roughly 163 Km.
The best day to arrive at Chiang Mai is Monday and it would be best to avoid Sunday, as prices are on average 43.77% higher than on Monday. (Average prices, based on 6770173 datapoints.)
We have a lot more statistics for flights SL 509 and between Chiang Mai and Bangkok.