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 Labuan is April and the most expensive month to fly is June. (Average prices, based on 1864 datapoints.)
The best day to arrive at Kuala Lumpur is Monday and it would be best to avoid Friday, as prices are on average 67.99% higher than on Monday. (Average prices, based on 1859 datapoints.)