Flight Brisbane Airport departs from Brisbane Brisbane Airport at 19:30 and arrives at Sydney Sydney Airport at 22:05.
The flighttime is about 2h 35m. The distance travelled ("as the bird flies"): 680 Km. So the average speed is roughly 263 Km.
The best day to arrive at Brisbane is Monday and it would be best to avoid Sunday, as prices are on average 174.64% higher than on Monday. (Average prices, based on 5457288 datapoints.)
We have a lot more statistics for flights JQ 823 and between Brisbane and Sydney.