Flight Sydney Airport departs from Sydney Sydney Airport at 11:35 and arrives at Cairns Cairns Airport at 14:40.
The flighttime is about 3h 05m. The distance travelled ("as the bird flies"): 1723 Km. So the average speed is roughly 559 Km.
The best day to arrive at Sydney is Wednesday and it would be best to avoid Friday, as prices are on average 462.13% higher than on Wednesday. (Average prices, based on 176022 datapoints.)
We have a lot more statistics for flights QF 924 and between Sydney and Cairns.