Please be aware that Taipei and Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Taipei and Jakarta is February and the most expensive month to fly is January. (Average prices, based on 1770 datapoints.)
The best day to arrive at Taipei is Tuesday and it would be best to avoid Wednesday, as prices are on average 15.53% higher than on Tuesday. (Average prices, based on 1770 datapoints.)