Flight Suvarnabhumi Airport departs from Bangkok Suvarnabhumi Airport at 07:00 and arrives at Sukhothai Sukhothai Airport at 08:20.
The flighttime is about 1h 20m. The distance travelled ("as the bird flies"): 125 Km. So the average speed is roughly 94 Km.
The best day to arrive at Bangkok is Tuesday and it would be best to avoid Monday, as prices are on average 88.61% higher than on Tuesday. (Average prices, based on 51246 datapoints.)
We have a lot more statistics for flights PG 211 and between Bangkok and Sukhothai.
