United Airlines has crazy cheap flights from the US to Australia if you can go at the end of this month. Depart August 16-19, return August 23-26, but you must purchase by Friday August 13th. From LAX and SFO to Sydney it’s $499 r/t, from New York it’s $599 r/t. Other cities are available. It never gets less expensive than this, so if you can get outta town quickly, this is a great fare.