Flight Sabiha Gökcen International Airport departs from Istanbul Sabiha Gökcen International Airport at 00:45 and arrives at Tehran Imam Khomeini International Airport at 04:15.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 2471 Km. So the average speed is roughly 988 Km.
There is an 1 hour time difference between Istanbul and Tehran