Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 08:30 and arrives at Chiang Mai Chiang Mai International Airport at 09:50.
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 Monday and it would be best to avoid Friday, as prices are on average 79.16% higher than on Monday. (Average prices, based on 8638702 datapoints.)
We have a lot more statistics for flights FD 4104 and between Bangkok and Chiang Mai.