Flight Incheon International Airport departs from Seoul Incheon International Airport at 12:20 and arrives at Rome Leonardo da Vinci–Fiumicino Airport at 18:30.
The flighttime is about 13h 10m. The distance travelled ("as the bird flies"): 12686 Km. So the average speed is roughly 963 Km.
There is an 7 hour time difference between Seoul and Rome