Flight Hong Kong International Airport departs from Hong Kong Hong Kong International Airport at 09:20 and arrives at Seoul Incheon International Airport at 11:20.The flight has a short stop at Shanghai.
The flighttime is about 1h 00m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 1621 Km.
There is an 1 hour time difference between Hong Kong and Seoul