Flight Istanbul Atatürk Airport departs from Istanbul Istanbul Atatürk Airport at 02:20 and arrives at Seoul Incheon International Airport at 18:20.
The flighttime is about 9h 00m. The distance travelled ("as the bird flies"): 10850 Km. So the average speed is roughly 1206 Km.
There is an 7 hour time difference between Istanbul and Seoul