Flight Incheon International Airport departs from Seoul Incheon International Airport at 21:40 and arrives at Hong Kong Hong Kong International Airport at 00:25.
The flighttime is about 3h 45m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 432 Km.
There is an 1 hour time difference between Seoul and Hong Kong
The best day to arrive at Seoul is Sunday and it would be best to avoid Monday, as prices are on average 51.5% higher than on Sunday. (Average prices, based on 18525114 datapoints.)
We have a lot more statistics for flights 7C 2107 and between Seoul and Hong Kong.