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 Singapore is October and the most expensive month to fly is June. (Average prices, based on 185447 datapoints.)
The best day to arrive at Jakarta is Saturday and it would be best to avoid Friday, as prices are on average 17.9% higher than on Saturday. (Average prices, based on 533124 datapoints.)
The cheapest airline flying from Jakarta to Singapore is Indonesia AirAsia. They are 87% cheaper than Singapore Airlines. (Average prices, based on 185472 datapoints.)
The best time to fly is at around 21. (Average prices, based on 205470 datapoints.)