Flight Hangzhou Xiaoshan International Airport departs from Hangzhou Hangzhou Xiaoshan International Airport at 09:10 and arrives at Seoul Incheon International Airport at 12:05.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 801 Km. So the average speed is roughly 418 Km.
There is an 1 hour time difference between Hangzhou and Seoul