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 Wednesday and it would be best to avoid Monday, as prices are on average 14.57% higher than on Wednesday. (Average prices, based on 17125688 datapoints.)
The best time to fly is at around 9. (Average prices, based on 7564 datapoints.)