The best month to fly between Surabaya and Singapore is October and the most expensive month to fly is June. (Average prices, based on 519 datapoints.)
The best day to arrive at Surabaya is Friday and it would be best to avoid Monday, as prices are on average 142.75% higher than on Friday. (Average prices, based on 17614662 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7233 datapoints.)