Please be aware that Yogyakarta has multiple airports and that these results are for all airports serving the city.
The best month to fly between Yogyakarta and Palembang is September and the most expensive month to fly is June. (Average prices, based on 6540 datapoints.)
The best day to arrive at Yogyakarta is Wednesday and it would be best to avoid Sunday, as prices are on average 19.13% higher than on Wednesday. (Average prices, based on 2261 datapoints.)