Please be aware that Bangkok and Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Bangkok and Jakarta is October and the most expensive month to fly is June. (Average prices, based on 23958 datapoints.)
The best day to arrive at Bangkok is Wednesday and it would be best to avoid Sunday, as prices are on average 52.69% higher than on Wednesday. (Average prices, based on 23883 datapoints.)