Flight Kansai International Airport departs from Osaka Kansai International Airport at 10:40 and arrives at Seoul Incheon International Airport at 12:35.
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 Thursday and it would be best to avoid Sunday, as prices are on average 240.4% higher than on Thursday. (Average prices, based on 5271751 datapoints.)
We have a lot more statistics for flights LJ 232 and between Osaka and Seoul.