The best month to fly between Hanoi and Bangkok is November and the most expensive month to fly is September. (Average prices, based on 1155 datapoints.)
The best day to arrive at Hanoi is Thursday and it would be best to avoid Tuesday, as prices are on average 22.26% higher than on Thursday. (Average prices, based on 1156 datapoints.)
The cheapest airline flying from Hanoi to Bangkok is VietJet Air. They are 60% cheaper than Thai Airways. (Average prices, based on 1162 datapoints.)
The best time to fly is at around 15. (Average prices, based on 2124 datapoints.)