Please be aware that Bangkok has multiple airports and that these results are for all airports serving the city.
The best month to fly between Bangkok and Ho Chi Minh City is January and the most expensive month to fly is March. (Average prices, based on 458 datapoints.)
The best day to arrive at Bangkok is Thursday and it would be best to avoid Friday, as prices are on average 66.66% higher than on Thursday. (Average prices, based on 472 datapoints.)
The cheapest airline flying from Bangkok to Ho Chi Minh City is Thai AirAsia. They are 55% cheaper than Thai Airways. (Average prices, based on 470 datapoints.)
The best time to fly is at around 15. (Average prices, based on 742 datapoints.)