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 16.63% higher than on Saturday. (Average prices, based on 565382 datapoints.)
The cheapest airline flying from Jakarta to Singapore is Indonesia AirAsia. They are 87% cheaper than Singapore Airlines. (Average prices, based on 185473 datapoints.)