Fiji Airways has round-trip flights from Dallas (DFW) to Nadi (NAN) for $665-$704, NONSTOP. Flights July to March. Departures on Tuesday, Thursday, and Saturday. Extended weekends available. Origin/Destination reversible.
Some small OTAs on Skyscanner have this for as low as $645; which is cheaper than the airline.
Read More Nonstop Flights: Dallas to/from Nadi, Fiji $645-$704 r/t [July-March] – Fiji Airways