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 Bharu is February and the most expensive month to fly is August. (Average prices, based on 1214 datapoints.)
The best day to arrive at Kuala Lumpur is Monday and it would be best to avoid Saturday, as prices are on average 90.1% higher than on Monday. (Average prices, based on 1130 datapoints.)