Flight Hangzhou Xiaoshan International Airport departs from Hangzhou Hangzhou Xiaoshan International Airport at 23:15 and arrives at Bangkok Don Mueang International Airport at 02:25.
The flighttime is about 4h 10m. The distance travelled ("as the bird flies"): 2275 Km. So the average speed is roughly 546 Km.
There is an 1 hour time difference between Hangzhou and Bangkok