Flight El Tari International Airport departs from Kupang El Tari International Airport at 06:00 and arrives at Surabaya Juanda International Airport at 07:05.
The flighttime is about 2h 05m. The distance travelled ("as the bird flies"): 1219 Km. So the average speed is roughly 585 Km.
There is an 1 hour time difference between Kupang and Surabaya
The best month to arrive at Kupang is February and the most expensive month to fly is December. (Average prices, based on 2014 datapoints.)
We have a lot more statistics for flights JT 691 and between Kupang and Surabaya.