Please be aware that Yogyakarta has multiple airports and that these results are only for Adisutjipto International Airport.
The best month to arrive at Yogyakarta is March and the most expensive month to fly is May. (Average prices, based on 12333 datapoints.)
The best day to arrive at Yogyakarta is Monday and it would be best to avoid Friday, as prices are on average 4.2% higher than on Monday. (Average prices, based on 12202 datapoints.)