The best month to fly between Surabaya and Kupang is February and the most expensive month to fly is June. (Average prices, based on 42302 datapoints.)
The best day to arrive at Surabaya is Friday and it would be best to avoid Tuesday, as prices are on average 7.53% higher than on Friday. (Average prices, based on 18669508 datapoints.)
The best time to fly is at around 5. (Average prices, based on 49147 datapoints.)