Flight International Airport departs from Jeju City International Airport at 21:05 and arrives at Busan Gimhae International Airport at 22:00.
The flighttime is about 0h 55m. The distance travelled ("as the bird flies"): 296 Km. So the average speed is roughly 323 Km.
The best month to arrive at Jeju City is November and the most expensive month to fly is February. (Average prices, based on 268 datapoints.)
We have a lot more statistics for flights KE 1018 and between Jeju City and Busan.
THB