Flight Juanda International Airport departs from Surabaya Juanda International Airport at 21:25 and arrives at Jakarta Soekarno–Hatta International Airport at 23:05.
The flighttime is about 1h 40m. The distance travelled ("as the bird flies"): 682 Km. So the average speed is roughly 409 Km.
The best month to arrive at Surabaya is February and the most expensive month to fly is September. (Average prices, based on 1850 datapoints.)
The best day to arrive at Surabaya is Wednesday and it would be best to avoid Tuesday, as prices are on average 37.6% higher than on Wednesday. (Average prices, based on 566372641 datapoints.)
We have a lot more statistics for flights QG 9721 and between Surabaya and Jakarta.
THB