Flight Incheon International Airport departs from Seoul Incheon International Airport at 19:35 and arrives at Hong Kong Hong Kong International Airport at 22:40.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 397 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 Monday, as prices are on average 20.15% higher than on Tuesday. (Average prices, based on 21272672 datapoints.)
We have a lot more statistics for flights CX 419 and between Seoul and Hong Kong.