The best month to fly between Surabaya and Singapore is October and the most expensive month to fly is June. (Average prices, based on 506 datapoints.)
The best day to arrive at Surabaya is Friday and it would be best to avoid Sunday, as prices are on average 17.8% higher than on Friday. (Average prices, based on 17270034 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7090 datapoints.)