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 Sunday, as prices are on average 106.18% higher than on Friday. (Average prices, based on 17041692 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7466 datapoints.)