Flight Boryspil International Airport departs from Kiev Boryspil International Airport at 20:00 and arrives at Tehran Imam Khomeini International Airport at 01:25.
The flighttime is about 4h 25m. The distance travelled ("as the bird flies"): 2566 Km. So the average speed is roughly 581 Km.
There is an 1 hour time difference between Kiev and Tehran