Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 16:20 and arrives at Chiang Mai Chiang Mai International Airport at 17:35.
The flighttime is about 1h 15m. The distance travelled ("as the bird flies"): 221 Km. So the average speed is roughly 177 Km.
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Monday, as prices are on average 23.22% higher than on Wednesday. (Average prices, based on 8378639 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 187 datapoints.)
We have a lot more statistics for flights H1 4728 and between Bangkok and Chiang Mai.