Please be aware that Bangkok has multiple airports and that these results are for all airports serving the city.
The best month to arrive at Bangkok is August and the most expensive month to fly is September. (Average prices, based on 10194 datapoints.)
The best day to arrive at Bangkok is Sunday and it would be best to avoid Saturday, as prices are on average 21.5% higher than on Sunday. (Average prices, based on 13834 datapoints.)
The cheapest airline flying to Bangkok is Thai Vietjet Air. They are 86% cheaper than Cathay Pacific. (Average prices, based on 10414 datapoints.)
At Bangkok the most flights depart around 17:00. (Hourly flights, based on 11870 datapoints.)
From Bangkok it is on average the cheapest to fly to Chiang Mai and to Phuket. (Average prices, based on 7250 datapoints.)
From Bangkok most of the flights depart to Kuala Lumpur, second best connected from Bangkok is Chiang Mai. (Daily flights, based on 908 datapoints.)