Flight Changi Airport departs from Singapore Changi Airport at 17:30 and arrives at Surabaya Juanda International Airport at 18:50.
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 Singapore and Surabaya
The best day to arrive at Singapore is Sunday and it would be best to avoid Monday, as prices are on average 113.76% higher than on Sunday. (Average prices, based on 18982620 datapoints.)
We have a lot more statistics for flights SQ 8506 and between Singapore and Surabaya.
