Flight Mactan-Cebu International Airport departs from Cebu Mactan-Cebu International Airport at 00:45 and arrives at Seoul Incheon International Airport at 06:25.
The flighttime is about 4h 40m. The distance travelled ("as the bird flies"): 1750 Km. So the average speed is roughly 375 Km.
There is an 1 hour time difference between Cebu and Seoul