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 Bandung is October and the most expensive month to fly is April. (Average prices, based on 1581 datapoints.)
The best day to arrive at Jakarta is Saturday and it would be best to avoid Sunday, as prices are on average 41.96% higher than on Saturday. (Average prices, based on 1581 datapoints.)