Air distance from Saint-Denis, Reunion (French) to Hanoi, Vietnam is 4443.7 Miles (7151.5 Kilometers / 3858.9 Nautical Miles).
Flight duration time from Saint-Denis to Hanoi is 9 hrs, 13 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.