Flight Incheon International Airport departs from Seoul Incheon International Airport at 22:35 and arrives at Hong Kong Hong Kong International Airport at 01:10.
The flighttime is about 3h 35m. The distance travelled ("as the bird flies"): 1621 Km. So the average speed is roughly 452 Km.
There is an 1 hour time difference between Seoul and Hong Kong
The best day to arrive at Seoul is Monday and it would be best to avoid Sunday, as prices are on average 125.18% higher than on Monday. (Average prices, based on 18000445 datapoints.)
We have a lot more statistics for flights UO 627 and between Seoul and Hong Kong.