Flight Incheon International Airport departs from Seoul Incheon International Airport at 13:25 and arrives at Hong Kong Hong Kong International Airport at 16:20.
The flighttime is about 3h 55m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 414 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 Friday, as prices are on average 265.88% higher than on Sunday. (Average prices, based on 18206396 datapoints.)
We have a lot more statistics for flights KE 175 and between Seoul and Hong Kong.