Please be aware that Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Jakarta and Medan is October and the most expensive month to fly is December. (Average prices, based on 261523 datapoints.)
The best day to arrive at Jakarta is Tuesday and it would be best to avoid Saturday, as prices are on average 3.67% higher than on Tuesday. (Average prices, based on 1002038 datapoints.)
The cheapest airline flying from Jakarta to Medan is Lion Air. They are 52% cheaper than Garuda Indonesia. (Average prices, based on 261557 datapoints.)
The best time to fly is at around 4. (Average prices, based on 281557 datapoints.)