Flight Incheon International Airport departs from Seoul Incheon International Airport at 15:35 and arrives at Changsha Huanghua International Airport at 18:15.
The flighttime is about 3h 40m. The distance travelled ("as the bird flies"): 1554 Km. So the average speed is roughly 424 Km.
There is an 1 hour time difference between Seoul and Changsha
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