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 June. (Average prices, based on 19088 datapoints.)
The best day to arrive at Jakarta is Wednesday and it would be best to avoid Friday, as prices are on average 12.98% higher than on Wednesday. (Average prices, based on 19088 datapoints.)