Flight Brisbane Airport departs from Brisbane Brisbane Airport at 09:05 and arrives at Sydney Sydney Airport at 11:40.
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 month to arrive at Brisbane is May and the most expensive month to fly is July. (Average prices, based on 6294 datapoints.)
We have a lot more statistics for flights SQ 6699 and between Brisbane and Sydney.