The best month to fly between Penang and Jakarta is October and the most expensive month to fly is May. (Average prices, based on 1882 datapoints.)
The best day to arrive at Penang is Tuesday and it would be best to avoid Saturday, as prices are on average 65.7% higher than on Tuesday. (Average prices, based on 578 datapoints.)
The cheapest airline flying from Penang to Jakarta is AirAsia. They are 26% cheaper than Batik Air. (Average prices, based on 1885 datapoints.)