Flight Hangzhou Xiaoshan International Airport departs from Hangzhou Hangzhou Xiaoshan International Airport at 23:55 and arrives at Bangkok Suvarnabhumi Airport at 03:10.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 2261 Km. So the average speed is roughly 532 Km.
There is an 1 hour time difference between Hangzhou and Bangkok