Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 17:20 and arrives at Chiang Mai Chiang Mai International Airport at 18:30.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 221 Km. So the average speed is roughly 189 Km.
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Monday, as prices are on average 74.36% higher than on Tuesday. (Average prices, based on 8451423 datapoints.)
We have a lot more statistics for flights TG 116 and between Bangkok and Chiang Mai.