Flight Incheon International Airport departs from Seoul Incheon International Airport at 19:45 and arrives at Hong Kong Hong Kong International Airport at 22:30.
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 Tuesday and it would be best to avoid Thursday, as prices are on average 53.38% higher than on Tuesday. (Average prices, based on 21364333 datapoints.)
We have a lot more statistics for flights KE 177 and between Seoul and Hong Kong.