Flight Kansai International Airport departs from Osaka Kansai International Airport at 11:55 and arrives at Seoul Incheon International Airport at 14:00.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1002 Km. So the average speed is roughly 481 Km.
The best day to arrive at Osaka is Thursday and it would be best to avoid Sunday, as prices are on average 108.29% higher than on Thursday. (Average prices, based on 6390115 datapoints.)
We have a lot more statistics for flights KE 724 and between Osaka and Seoul.