Flight Brisbane Airport departs from Brisbane Brisbane Airport at 20:05 and arrives at Sydney Sydney Airport at 21:40.
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 Friday and it would be best to avoid Saturday, as prices are on average 99.99% higher than on Friday. (Average prices, based on 5453679 datapoints.)
We have a lot more statistics for flights VA 992 and between Brisbane and Sydney.
IDR