Flight Wujiaba International Airport departs from Kunming Wujiaba International Airport at 23:30 and arrives at Seoul Incheon International Airport at 04:50.
The flighttime is about 4h 20m. The distance travelled ("as the bird flies"): 2684 Km. So the average speed is roughly 619 Km.
There is an 1 hour time difference between Kunming and Seoul
