Please be aware that Bangkok and Kuala Lumpur has multiple airports and that these results are for all airports serving the city.
The best month to fly between Bangkok and Kuala Lumpur is May and the most expensive month to fly is February. (Average prices, based on 1185 datapoints.)
The best day to arrive at Bangkok is Monday and it would be best to avoid Wednesday, as prices are on average 39.39% higher than on Monday. (Average prices, based on 4012 datapoints.)
The cheapest airline flying from Bangkok to Kuala Lumpur is Thai AirAsia. They are 67% cheaper than Thai Airways. (Average prices, based on 1212 datapoints.)
The best time to fly is at around 8. (Average prices, based on 4967 datapoints.)