Air distance from Saint-Denis, Reunion (French) to Tehran, Iran is 3873.2 Miles (6233.3 Kilometers / 3363.5 Nautical Miles).
Flight duration time from Saint-Denis to Tehran is 8 hrs, 2 mins. This is the In-The-Air flight time. You should also add the taxi time, airport wait times and possible delays due to bad weather, etc. for the total flight duration time.