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 Banjarmasin is August and the most expensive month to fly is March. (Average prices, based on 1285 datapoints.)
The best day to arrive at Yogyakarta is Wednesday and it would be best to avoid Monday, as prices are on average 13.33% higher than on Wednesday. (Average prices, based on 1275 datapoints.)