Flight Sydney Airport departs from Sydney Sydney Airport at 10:25 and arrives at Singapore Changi Airport at 16:50.
The flighttime is about 8h 25m. The distance travelled ("as the bird flies"): 5577 Km. So the average speed is roughly 663 Km.
There is an 2 hour time difference between Sydney and Singapore
The best month to arrive at Sydney is November and the most expensive month to fly is December. (Average prices, based on 1069 datapoints.)
The best day to arrive at Sydney is Tuesday and it would be best to avoid Saturday, as prices are on average 73.33% higher than on Tuesday. (Average prices, based on 338900 datapoints.)
We have a lot more statistics for flights QF 81 and between Sydney and Singapore.