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 Surabaya is February and the most expensive month to fly is June. (Average prices, based on 78692 datapoints.)
The best day to arrive at Kuala Lumpur is Wednesday and it would be best to avoid Thursday, as prices are on average 7.21% higher than on Wednesday. (Average prices, based on 48996 datapoints.)
The best time to fly is at around 20. (Average prices, based on 98694 datapoints.)