Flight Incheon International Airport departs from Seoul Incheon International Airport at 00:35 and arrives at Addis Ababa Bole International Airport at 07:45.
The flighttime is about 13h 10m. The distance travelled ("as the bird flies"): 9388 Km. So the average speed is roughly 713 Km.
There is an 6 hour time difference between Seoul and Addis Ababa