Flight Incheon International Airport departs from Seoul Incheon International Airport at 07:50 and arrives at Osaka Kansai International Airport at 09:40.
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 month to arrive at Seoul is July and the most expensive month to fly is December. (Average prices, based on 21480 datapoints.)
We have a lot more statistics for flights LJ 231 and between Seoul and Osaka.