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 Penang is February and the most expensive month to fly is June. (Average prices, based on 4553 datapoints.)
The best day to arrive at Jakarta is Friday and it would be best to avoid Thursday, as prices are on average 19.87% higher than on Friday. (Average prices, based on 7192 datapoints.)
The cheapest airline flying from Jakarta to Penang is Indonesia AirAsia. They are 11% cheaper than Batik Air. (Average prices, based on 4556 datapoints.)