The best month to fly between Hanoi and Kuala Lumpur is August and the most expensive month to fly is May. (Average prices, based on 230 datapoints.)
The best day to arrive at Hanoi is Wednesday and it would be best to avoid Saturday, as prices are on average 46.5% higher than on Wednesday. (Average prices, based on 228 datapoints.)
The cheapest airline flying from Hanoi to Kuala Lumpur is AirAsia. They are 41% cheaper than Vietnam Airlines. (Average prices, based on 235 datapoints.)