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 Johor Bahru is August and the most expensive month to fly is December. (Average prices, based on 1081 datapoints.)
The best day to arrive at Jakarta is Sunday and it would be best to avoid Friday, as prices are on average 62.13% higher than on Sunday. (Average prices, based on 1074 datapoints.)