Flight Changi Airport departs from Singapore Changi Airport at 07:50 and arrives at Surabaya Juanda International Airport at 09:20.
The flighttime is about 2h 30m. The distance travelled ("as the bird flies"): 1022 Km. So the average speed is roughly 409 Km.
There is an 1 hour time difference between Singapore and Surabaya
The best day to arrive at Singapore is Friday and it would be best to avoid Monday, as prices are on average 92.99% higher than on Friday. (Average prices, based on 13333059 datapoints.)
We have a lot more statistics for flights LH 7232 and between Singapore and Surabaya.