Flight Hangzhou Xiaoshan International Airport departs from Hangzhou Hangzhou Xiaoshan International Airport at 15:10 and arrives at Seoul Incheon International Airport at 18:10.
The flighttime is about 2h 00m. The distance travelled ("as the bird flies"): 801 Km. So the average speed is roughly 400 Km.
There is an 1 hour time difference between Hangzhou and Seoul