Flight Gaoqi International Airport departs from Xiamen Gaoqi International Airport at 08:30 and arrives at Seoul Incheon International Airport at 12:20.
The flighttime is about 2h 50m. The distance travelled ("as the bird flies"): 1197 Km. So the average speed is roughly 422 Km.
There is an 1 hour time difference between Xiamen and Seoul