Flight Incheon International Airport departs from Seoul Incheon International Airport at 22:15 and arrives at Jinan Yaoqiang Airport at 23:00.
The flighttime is about 1h 45m. The distance travelled ("as the bird flies"): 1027 Km. So the average speed is roughly 587 Km.
There is an 1 hour time difference between Seoul and Jinan
