Flight Gimpo International Airport departs from Seoul Gimpo International Airport at 14:20 and arrives at Jeju City International Airport at 15:30.
The flighttime is about 1h 10m. The distance travelled ("as the bird flies"): 271 Km. So the average speed is roughly 232 Km.
The best day to arrive at Seoul is Tuesday and it would be best to avoid Thursday, as prices are on average 977.3% higher than on Tuesday. (Average prices, based on 685258 datapoints.)
We have a lot more statistics for flights OZ 8963 and between Seoul and Jeju City.
