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 Wednesday and it would be best to avoid Tuesday, as prices are on average 14.11% higher than on Wednesday. (Average prices, based on 17313024 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7150 datapoints.)