Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 17:50 and arrives at Chiang Mai Chiang Mai International Airport at 19:10.
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 Monday and it would be best to avoid Tuesday, as prices are on average 156.75% higher than on Monday. (Average prices, based on 8384125 datapoints.)
We have a lot more statistics for flights TG 5707 and between Bangkok and Chiang Mai.