Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 07:25 and arrives at Chiang Mai Chiang Mai International Airport at 08:45.
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 Tuesday and it would be best to avoid Saturday, as prices are on average 75.88% higher than on Tuesday. (Average prices, based on 11072934 datapoints.)
We have a lot more statistics for flights TG 102 and between Bangkok and Chiang Mai.
