Flight Brisbane Airport departs from Brisbane Brisbane Airport at 19:00 and arrives at Sydney Sydney Airport at 20:35.
The flighttime is about 1h 35m. The distance travelled ("as the bird flies"): 680 Km. So the average speed is roughly 429 Km.
The best day to arrive at Brisbane is Wednesday and it would be best to avoid Thursday, as prices are on average 91.89% higher than on Wednesday. (Average prices, based on 5457185 datapoints.)
We have a lot more statistics for flights QF 549 and between Brisbane and Sydney.