Please be aware that Jakarta and Istanbul has multiple airports and that these results are for all airports serving the city.
The best month to fly between Jakarta and Istanbul is March and the most expensive month to fly is August. (Average prices, based on 1862 datapoints.)
The best day to arrive at Jakarta is Tuesday and it would be best to avoid Monday, as prices are on average 11.59% higher than on Tuesday. (Average prices, based on 1843 datapoints.)