Flight Incheon International Airport departs from Seoul Incheon International Airport at 12:40 and arrives at Osaka Kansai International Airport at 15:00.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 1002 Km. So the average speed is roughly 429 Km.
The best day to arrive at Seoul is Wednesday and it would be best to avoid Friday, as prices are on average 251.2% higher than on Wednesday. (Average prices, based on 1951040 datapoints.)
We have a lot more statistics for flights BX 174 and between Seoul and Osaka.