Air distance from London UK to Hanoi Vietnam is 5729.8 Miles (9221.2 Kilometers / 4975.7 Nautical Miles).
Flight duration time from London UK to Hanoi Vietnam is 11 hrs, 53 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.