Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 08:00 and arrives at Chiang Mai Chiang Mai International Airport at 09:20.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 221 Km. So the average speed is roughly 166 Km.
The best day to arrive at Bangkok is Saturday and it would be best to avoid Thursday, as prices are on average 217.67% higher than on Saturday. (Average prices, based on 8609407 datapoints.)
We have a lot more statistics for flights BR 3927 and between Bangkok and Chiang Mai.