Please be aware that Kuala Lumpur has multiple airports and that these results are for all airports serving the city.
The best month to fly between Kuala Lumpur and Langkawi is September and the most expensive month to fly is May. (Average prices, based on 469 datapoints.)
The best day to arrive at Kuala Lumpur is Tuesday and it would be best to avoid Friday, as prices are on average 83.41% higher than on Tuesday. (Average prices, based on 854 datapoints.)