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 Medan is March and the most expensive month to fly is July. (Average prices, based on 4670 datapoints.)
The best day to arrive at Yogyakarta is Sunday and it would be best to avoid Tuesday, as prices are on average 11.4% higher than on Sunday. (Average prices, based on 4672 datapoints.)