The best month to fly between Surabaya and Kupang is February and the most expensive month to fly is July. (Average prices, based on 7639 datapoints.)
The best day to arrive at Surabaya is Monday and it would be best to avoid Thursday, as prices are on average 9.85% higher than on Monday. (Average prices, based on 18785426 datapoints.)
The best time to fly is at around 5. (Average prices, based on 20193 datapoints.)