Flight Sydney Airport departs from Sydney Sydney Airport at 14:05 and arrives at Brisbane Brisbane Airport at 15:35.
The flighttime is about 1h 30m. The distance travelled ("as the bird flies"): 680 Km. So the average speed is roughly 453 Km.
The best day to arrive at Sydney is Thursday and it would be best to avoid Monday, as prices are on average 187.4% higher than on Thursday. (Average prices, based on 2637790 datapoints.)
We have a lot more statistics for flights QF 526 and between Sydney and Brisbane.