Flight Incheon International Airport departs from Seoul Incheon International Airport at 01:05 and arrives at Kota Kinabalu Kota Kinabalu International Airport at 05:35.
The flighttime is about 5h 30m. The distance travelled ("as the bird flies"): 2121 Km. So the average speed is roughly 386 Km.
There is an 1 hour time difference between Seoul and Kota Kinabalu
