United has round-trip flights from Austin (AUS) to Melbourne or Sydney (MEL/SYD) for $746-$758 with a connection. Flights August to November. Origin/Destination reversible. An Australian ETA (A Tourist Visa) is required for American Citizens.
Note: United is matching the AA sale from earlier today. The routing and connection times on UA is a bit better than the AA route.
Note: Be mindful of the time, date, and season change.