Flight Ninoy Aquino International Airport departs from Manila Ninoy Aquino International Airport at 01:05 and arrives at Seoul Incheon International Airport at 06:10.
The flighttime is about 4h 05m. The distance travelled ("as the bird flies"): 1530 Km. So the average speed is roughly 375 Km.
There is an 1 hour time difference between Manila and Seoul
