Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 10:20 and arrives at Chiang Mai Chiang Mai International Airport at 11:35.
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 Friday, as prices are on average 28.97% higher than on Wednesday. (Average prices, based on 8300699 datapoints.)
This graph shows the distribution of prices found in the past years for this flight. (Average prices, based on 186 datapoints.)
We have a lot more statistics for flights H1 4726 and between Bangkok and Chiang Mai.