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 Gunung Sitoli is August and the most expensive month to fly is December. (Average prices, based on 415 datapoints.)
The best day to arrive at Jakarta is Saturday and it would be best to avoid Monday, as prices are on average 11.83% higher than on Saturday. (Average prices, based on 415 datapoints.)