Flight Sydney Airport departs from Sydney Sydney Airport at 19:45 and arrives at Cairns Cairns Airport at 22:50.
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 Tuesday and it would be best to avoid Friday, as prices are on average 512.25% higher than on Tuesday. (Average prices, based on 175919 datapoints.)
We have a lot more statistics for flights JQ 956 and between Sydney and Cairns.