The best month to fly between Surabaya and Singapore is September and the most expensive month to fly is December. (Average prices, based on 988 datapoints.)
The best day to arrive at Surabaya is Friday and it would be best to avoid Monday, as prices are on average 56.02% higher than on Friday. (Average prices, based on 16960959 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7244 datapoints.)