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 Medan is October and the most expensive month to fly is January. (Average prices, based on 8813 datapoints.)
The best day to arrive at Kuala Lumpur is Wednesday and it would be best to avoid Sunday, as prices are on average 36.8% higher than on Wednesday. (Average prices, based on 9793 datapoints.)
The cheapest airline flying from Kuala Lumpur to Medan is Indonesia AirAsia. They are 40% cheaper than MasWings. (Average prices, based on 8829 datapoints.)
The best time to fly is at around 22. (Average prices, based on 18638 datapoints.)