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 February and the most expensive month to fly is June. (Average prices, based on 8818 datapoints.)
The best day to arrive at Yogyakarta is Monday and it would be best to avoid Saturday, as prices are on average 8.44% higher than on Monday. (Average prices, based on 1725 datapoints.)