Flight Istanbul Atatürk Airport departs from Istanbul Istanbul Atatürk Airport at 07:50 and arrives at Tehran Imam Khomeini International Airport at 11:30.
The flighttime is about 2h 40m. The distance travelled ("as the bird flies"): 2527 Km. So the average speed is roughly 948 Km.
There is an 1 hour time difference between Istanbul and Tehran