| Cheap Flights: Austin to/from Grand Cayman $271-$320 r/t [July-April] â United / Delta / American United, American, and Delta have round-trip flights from Austin (AUS) to Grand Cayman (GCM) for $271-$320 with a connection. Flights July to April. A few weekends available. Origin/Destination reversible. A Carry-on bag and also a personal item is allowed for free on American or Delta. United charges additional bag fees. 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 $271-$320 r/t [July-April] â United / Delta / American . | 