Flight Incheon International Airport departs from Seoul Incheon International Airport at 13:05 and arrives at Beijing Daxing International Airport at 13:55.
The flighttime is about 1h 50m. The distance travelled ("as the bird flies"): 1123 Km. So the average speed is roughly 613 Km.
There is an 1 hour time difference between Seoul and Beijing
THB
