Flight Incheon International Airport departs from Seoul Incheon International Airport at 19:25 and arrives at Hong Kong Hong Kong International Airport at 22:40.
The flighttime is about 4h 15m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 381 Km.
There is an 1 hour time difference between Seoul and Hong Kong
The best day to arrive at Seoul is Wednesday and it would be best to avoid Thursday, as prices are on average 72.79% higher than on Wednesday. (Average prices, based on 21212685 datapoints.)
We have a lot more statistics for flights OZ 745 and between Seoul and Hong Kong.