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 September and the most expensive month to fly is December. (Average prices, based on 283 datapoints.)
The best day to arrive at Jakarta is Monday and it would be best to avoid Friday, as prices are on average 57.11% higher than on Monday. (Average prices, based on 284 datapoints.)