Please be aware that Jakarta and Yogyakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Jakarta and Yogyakarta is March and the most expensive month to fly is June. (Average prices, based on 159339 datapoints.)
The best day to arrive at Jakarta is Monday and it would be best to avoid Friday, as prices are on average 21.94% higher than on Monday. (Average prices, based on 353946 datapoints.)
The best time to fly is at around 10. (Average prices, based on 179344 datapoints.)