Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 09:55 and arrives at Chiang Mai Chiang Mai International Airport at 11:15.
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 Thursday and it would be best to avoid Saturday, as prices are on average 36.11% higher than on Thursday. (Average prices, based on 8443069 datapoints.)
We have a lot more statistics for flights PG 223 and between Bangkok and Chiang Mai.