Please be aware that Yogyakarta and Jakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Yogyakarta and Jakarta is March and the most expensive month to fly is July. (Average prices, based on 100110 datapoints.)
The best day to arrive at Yogyakarta is Thursday and it would be best to avoid Sunday, as prices are on average 40.34% higher than on Thursday. (Average prices, based on 32200 datapoints.)
The best time to fly is at around 18. (Average prices, based on 120107 datapoints.)