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 Manila is May and the most expensive month to fly is March. (Average prices, based on 413 datapoints.)
The best day to arrive at Bangkok is Sunday and it would be best to avoid Wednesday, as prices are on average 34.64% higher than on Sunday. (Average prices, based on 410 datapoints.)
The cheapest airline flying from Bangkok to Manila is Philippines AirAsia. They are 39% cheaper than Thai Airways. (Average prices, based on 422 datapoints.)