Flight Juanda International Airport departs from Surabaya Juanda International Airport at 19:40 and arrives at Singapore Changi Airport at 23:00.
The flighttime is about 2h 20m. The distance travelled ("as the bird flies"): 1022 Km. So the average speed is roughly 438 Km.
There is an 1 hour time difference between Surabaya and Singapore
The best day to arrive at Surabaya is Friday and it would be best to avoid Monday, as prices are on average 67% higher than on Friday. (Average prices, based on 22448002 datapoints.)
We have a lot more statistics for flights SQ 8499 and between Surabaya and Singapore.