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 Bandung is March and the most expensive month to fly is July. (Average prices, based on 1947 datapoints.)
The best day to arrive at Yogyakarta is Tuesday and it would be best to avoid Sunday, as prices are on average 16.4% higher than on Tuesday. (Average prices, based on 5649 datapoints.)