The best month to fly between Hanoi and Kuala Lumpur is August and the most expensive month to fly is October. (Average prices, based on 200 datapoints.)
The best day to arrive at Hanoi is Wednesday and it would be best to avoid Sunday, as prices are on average 43% higher than on Wednesday. (Average prices, based on 200 datapoints.)
The cheapest airline flying from Hanoi to Kuala Lumpur is AirAsia. They are 44% cheaper than MasWings. (Average prices, based on 206 datapoints.)