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 Sydney is March and the most expensive month to fly is January. (Average prices, based on 747 datapoints.)
The best day to arrive at Jakarta is Monday and it would be best to avoid Tuesday, as prices are on average 18.15% higher than on Monday. (Average prices, based on 736 datapoints.)