Please be aware that Istanbul and Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Istanbul and Jakarta is November and the most expensive month to fly is July. (Average prices, based on 1554 datapoints.)
The best day to arrive at Istanbul is Monday and it would be best to avoid Saturday, as prices are on average 8.54% higher than on Monday. (Average prices, based on 681 datapoints.)