Flight Changi Airport departs from Singapore Changi Airport at 19:10 and arrives at Sydney Sydney Airport at 05:55.
The flighttime is about 8h 45m. The distance travelled ("as the bird flies"): 5577 Km. So the average speed is roughly 637 Km.
There is an 2 hour time difference between Singapore and Sydney
The best month to arrive at Singapore is November and the most expensive month to fly is February. (Average prices, based on 1088 datapoints.)
We have a lot more statistics for flights SQ 261 and between Singapore and Sydney.