Flight Istanbul Atatürk Airport departs from Istanbul Istanbul Atatürk Airport at 03:10 and arrives at Tehran Imam Khomeini International Airport at 06:45.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 2527 Km. So the average speed is roughly 978 Km.
There is an 1 hour time difference between Istanbul and Tehran