Please be aware that Kuala Lumpur and Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Kuala Lumpur and Jakarta is May and the most expensive month to fly is July. (Average prices, based on 373549 datapoints.)
The best day to arrive at Kuala Lumpur is Wednesday and it would be best to avoid Sunday, as prices are on average 17.25% higher than on Wednesday. (Average prices, based on 328495 datapoints.)
The cheapest airline flying from Kuala Lumpur to Jakarta is AirAsia. They are 52% cheaper than Garuda Indonesia. (Average prices, based on 373580 datapoints.)
The best time to fly is at around 22. (Average prices, based on 393576 datapoints.)