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 Monday and it would be best to avoid Friday, as prices are on average 82.55% higher than on Monday. (Average prices, based on 17294826 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7098 datapoints.)