American Airlines currently has fares as low as $961 roundtrip for travel from a number of Delta hubs to Sydney Australia.
Atlanta, Detroit, Salt Lake City, Minneapolis to Sydney, Australia
- Valid for outbound 2/20-6/21 or 7/24-9/17 or 11/1-11/30
- Sunday through Wednesday departures and returns.
- 7 day minimum stay is required.
- 3 day advanced purchase required.
You should also be able to earn bonus miles if you travel before May 31, 2016. You can find details of the bonus and register here.
For more information and analysis, see this Fare Deal Alert post.