Flight Incheon International Airport departs from Seoul Incheon International Airport at 18:35 and arrives at Fukuoka Fukuoka Airport at 20:00.
The flighttime is about 1h 25m. The distance travelled ("as the bird flies"): 518 Km. So the average speed is roughly 366 Km.
The best day to arrive at Seoul is Thursday and it would be best to avoid Saturday, as prices are on average 375.39% higher than on Thursday. (Average prices, based on 675926 datapoints.)
We have a lot more statistics for flights KE 781 and between Seoul and Fukuoka.