Air distance from Hanoi, Vietnam to Brazzaville, Congo is 6342.9 Miles (10208 Kilometers / 5508.2 Nautical Miles).
Flight duration time from Hanoi to Brazzaville is 13 hrs, 10 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.