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 October and the most expensive month to fly is December. (Average prices, based on 269 datapoints.)
The best day to arrive at Yogyakarta is Tuesday and it would be best to avoid Friday, as prices are on average 3.85% higher than on Tuesday. (Average prices, based on 269 datapoints.)