Air Canada has round-trip flights from Seattle (SEA) to Brisbane (BNE) for $782 with a connection. Flights September to October. Departures on Monday, Wednesday, and Sunday. 7-day minimum stay required.
Priceline has “Express Deals” for about $724. With “Express Deals” the airline and exact flight are hidden until after purchase and those purchases are final. There is no 24-hour free cancellation for “Express Deals”. The flight is guaranteed to be on a major airline. Be sure to select the deal with 0 to 1 stops and a layover less than 3-hours.