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 Saturday and it would be best to avoid Tuesday, as prices are on average 14.14% higher than on Saturday. (Average prices, based on 18863329 datapoints.)
The best time to fly is at around 5. (Average prices, based on 20218 datapoints.)