Flight Gimpo International Airport departs from Seoul Gimpo International Airport at 16:10 and arrives at Tokyo Haneda Airport at 18:30.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 1450 Km. So the average speed is roughly 621 Km.
The best day to arrive at Seoul is Saturday and it would be best to avoid Monday, as prices are on average 20.18% higher than on Saturday. (Average prices, based on 1082734 datapoints.)
We have a lot more statistics for flights KE 2103 and between Seoul and Tokyo.