Flight Imam Khomeini International Airport departs from Tehran Imam Khomeini International Airport at 04:30 and arrives at Moscow Sheremetyevo International Airport at 08:00.
The flighttime is about 4h 30m. The distance travelled ("as the bird flies"): 2224 Km. So the average speed is roughly 494 Km.
There is an 1 hour time difference between Tehran and Moscow