Fiji Airways has round-trip flights from Dallas (DFW) to Sydney, Australia (SYD) for $763-$810 with a connection. Flights May, June, August, September, October, November, January, and February. Departures on Tuesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible. No Thanksgiving dates.
Some small OTAs on Skyscanner have this for as low as $712; which is cheaper than the airline.