Flight Kansai International Airport departs from Osaka Kansai International Airport at 20:25 and arrives at Seoul Incheon International Airport at 22:15.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 1002 Km. So the average speed is roughly 547 Km.
The best day to arrive at Osaka is Saturday and it would be best to avoid Wednesday, as prices are on average 333.44% higher than on Saturday. (Average prices, based on 5442086 datapoints.)
We have a lot more statistics for flights NH 6979 and between Osaka and Seoul.