Delta has round-trip flights from Austin (AUS) to Grand Cayman (GCM) for $325 with a connection. Flights in September. Origin/Destination reversible.
Note: Carry-on bag is allowed for free on Delta. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Cheap Flights: Austin to/from Grand Cayman $325 r/t – Delta