Flight Sydney Airport departs from Sydney Sydney Airport at 15:20 and arrives at Cairns Cairns Airport at 18:35.
The flighttime is about 3h 15m. The distance travelled ("as the bird flies"): 1723 Km. So the average speed is roughly 530 Km.
The best day to arrive at Sydney is Wednesday and it would be best to avoid Friday, as prices are on average 364.01% higher than on Wednesday. (Average prices, based on 175921 datapoints.)
We have a lot more statistics for flights VA 1423 and between Sydney and Cairns.