Flight Sydney Airport departs from Sydney Sydney Airport at 14:45 and arrives at Cairns Cairns Airport at 17:00.
The flighttime is about 2h 15m. The distance travelled ("as the bird flies"): 1723 Km. So the average speed is roughly 766 Km.
The best day to arrive at Sydney is Saturday and it would be best to avoid Monday, as prices are on average 66.93% higher than on Saturday. (Average prices, based on 180855 datapoints.)
We have a lot more statistics for flights VA 1421 and between Sydney and Cairns.