Flight Changi Airport departs from Singapore Changi Airport at 10:00 and arrives at Sydney Sydney Airport at 19:45.
The flighttime is about 7h 45m. The distance travelled ("as the bird flies"): 5577 Km. So the average speed is roughly 720 Km.
There is an 2 hour time difference between Singapore and Sydney
The best day to arrive at Singapore is Friday and it would be best to avoid Saturday, as prices are on average 886.89% higher than on Friday. (Average prices, based on 398862 datapoints.)
We have a lot more statistics for flights TR 12 and between Singapore and Sydney.