Flight International Airport departs from Jeju City International Airport at 18:20 and arrives at Busan Gimhae International Airport at 19:20.
The flighttime is about 1h 00m. The distance travelled ("as the bird flies"): 296 Km. So the average speed is roughly 296 Km.
The best day to arrive at Jeju City is Saturday and it would be best to avoid Friday, as prices are on average 70.19% higher than on Saturday. (Average prices, based on 154745 datapoints.)
We have a lot more statistics for flights KE 1550 and between Jeju City and Busan.