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 September and the most expensive month to fly is June. (Average prices, based on 24719 datapoints.)
The best day to arrive at Kuala Lumpur is Tuesday and it would be best to avoid Friday, as prices are on average 21.17% higher than on Tuesday. (Average prices, based on 4140 datapoints.)
The best time to fly is at around 18. (Average prices, based on 44724 datapoints.)