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 Kupang is March and the most expensive month to fly is December. (Average prices, based on 9431 datapoints.)
The best day to arrive at Jakarta is Sunday and it would be best to avoid Monday, as prices are on average 4.14% higher than on Sunday. (Average prices, based on 9437 datapoints.)
The cheapest airline flying from Jakarta to Kupang is Citilink. They are 28% cheaper than Garuda Indonesia. (Average prices, based on 9438 datapoints.)