Flight Incheon International Airport departs from Seoul Incheon International Airport at 22:15 and arrives at Hong Kong Hong Kong International Airport at 01:15.
The flighttime is about 4h 00m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 405 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 Sunday, as prices are on average 121.07% higher than on Tuesday. (Average prices, based on 17928980 datapoints.)
We have a lot more statistics for flights TW 117 and between Seoul and Hong Kong.