Flight Kansai International Airport departs from Osaka Kansai International Airport at 11:55 and arrives at Seoul Incheon International Airport at 13:50.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 1002 Km. So the average speed is roughly 523 Km.
The best day to arrive at Osaka is Saturday and it would be best to avoid Tuesday, as prices are on average 225.25% higher than on Saturday. (Average prices, based on 5420392 datapoints.)
We have a lot more statistics for flights KE 2118 and between Osaka and Seoul.