Searching Kayak, we found seats departing New York JFK on Wednesday, March 6, returning from Sydney SYD on Wednesday, March 20.
Other dates are also available for travel on scattered dates throughout the year. The price will be slightly higher on Delta's website, but you'll be able to find certain flights for under $600 roundtrip when searching on certain third-party sites.
See our Sydney (SYD) fare listings for a complete look at current finds to the land down under.
Need a room in Sydney? Here's what's available for the above dates on Hotelwatchdog.