Flight Phu Quoc International Airport departs from Phu Quoc Phu Quoc International Airport at 21:20 and arrives at Seoul Incheon International Airport at 04:50.
The flighttime is about 5h 30m. The distance travelled ("as the bird flies"): 2751 Km. So the average speed is roughly 500 Km.
There is an 2 hour time difference between Phu Quoc and Seoul