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 Hong Kong is October and the most expensive month to fly is January. (Average prices, based on 2399 datapoints.)
The best day to arrive at Jakarta is Wednesday and it would be best to avoid Sunday, as prices are on average 24.67% higher than on Wednesday. (Average prices, based on 2404 datapoints.)