Flight Incheon International Airport departs from Seoul Incheon International Airport at 09:30 and arrives at Vientiane Wattay International Airport at 12:55.
The flighttime is about 5h 25m. The distance travelled ("as the bird flies"): 2770 Km. So the average speed is roughly 511 Km.
There is an 2 hour time difference between Seoul and Vientiane
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