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 Kota Kinabalu is July and the most expensive month to fly is June. (Average prices, based on 2149 datapoints.)
The best day to arrive at Kuala Lumpur is Wednesday and it would be best to avoid Thursday, as prices are on average 89.61% higher than on Wednesday. (Average prices, based on 2294 datapoints.)
The cheapest airline flying from Kuala Lumpur to Kota Kinabalu is AirAsia. They are 28% cheaper than AirAsia X. (Average prices, based on 2196 datapoints.)
The best time to fly is at around 23. (Average prices, based on 3698 datapoints.)