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 Tuesday and it would be best to avoid Saturday, as prices are on average 61.45% higher than on Tuesday. (Average prices, based on 17094052 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7538 datapoints.)