Flight Incheon International Airport departs from Seoul Incheon International Airport at 21:50 and arrives at Hong Kong Hong Kong International Airport at 00:55.
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 Thursday and it would be best to avoid Wednesday, as prices are on average 52.97% higher than on Thursday. (Average prices, based on 21209756 datapoints.)
We have a lot more statistics for flights UO 627 and between Seoul and Hong Kong.