Flight Incheon International Airport departs from Seoul Incheon International Airport at 17:50 and arrives at Denpasar Bali Ngurah Rai International Airport at 23:45.
The flighttime is about 6h 55m. The distance travelled ("as the bird flies"): 2831 Km. So the average speed is roughly 409 Km.
There is an 1 hour time difference between Seoul and Denpasar Bali