Please be aware that Jakarta and Seoul has multiple airports and that these results are for all airports serving the city.
The best month to fly between Jakarta and Seoul is November and the most expensive month to fly is October. (Average prices, based on 2708 datapoints.)
The best day to arrive at Jakarta is Thursday and it would be best to avoid Saturday, as prices are on average 25.88% higher than on Thursday. (Average prices, based on 2718 datapoints.)