Flight Gimpo International Airport departs from Seoul Gimpo International Airport at 15:00 and arrives at Jeju City International Airport at 16:10.
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 Monday and it would be best to avoid Saturday, as prices are on average 262.52% higher than on Monday. (Average prices, based on 437978 datapoints.)
We have a lot more statistics for flights LJ 511 and between Seoul and Jeju City.
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