Flight Sydney Airport departs from Sydney Sydney Airport at 20:10 and arrives at Cairns Cairns Airport at 22:05.
The flighttime is about 1h 55m. The distance travelled ("as the bird flies"): 1723 Km. So the average speed is roughly 899 Km.
The best day to arrive at Sydney is Tuesday and it would be best to avoid Friday, as prices are on average 538.97% higher than on Tuesday. (Average prices, based on 175399 datapoints.)
We have a lot more statistics for flights JQ 958 and between Sydney and Cairns.