Flight Incheon International Airport departs from Seoul Incheon International Airport at 21:30 and arrives at Tagbilaran Tagbilaran Airport at 01:15.
The flighttime is about 4h 45m. The distance travelled ("as the bird flies"): 1789 Km. So the average speed is roughly 377 Km.
There is an 1 hour time difference between Seoul and Tagbilaran
