American Airlines have round trip airfares travelling from San Francisco (SFO) to Sydney (SYD) for $746, making 1 stop or Melbourne (MEL) for $753, making 2 stops.
Departs SFO to SYD
: Monday thru Thursday from July 26 thru Sept 11; Sept 17-20, 24; Oct 22-24, 29-31; Nov 1, 5-8, 12-14, 19-22, 26-27; Dec 4
Departs SFO to MEL: Aug 21, 28, 29; Sept 18
Returns: wide and good availability. Generally a 7-day stay works best but my sample shows a 10-day stay.
Use dates and book it with your favorite OTA such as Expedia [expedia.com]
, Travelocity [travelocity.com]
, Priceline [priceline.com]
. Bundling hotel with airfare will save money.
Australia Tourism Guide [australia.com]