| Cheap Flights: Austin to Providenciales, Turks & Caicos Islands $240 r/t [March] â Southwest Southwest has round-trip flights from Austin (AUS) to Providenciales, Turks & Caicos Islands (PLS) for $24o, with a connection. $79-$161 each-way. Flights are mostly in March. Origin/Destination reversible. Southwest doesnât charge a fee for changes, cancellations, or carry-on bags. Click for more details and booking links Cheap Flights: Austin to Providenciales, Turks & Caicos Islands $240 r/t [March] â Southwest . | 