| Cheap Flights: Austin to/from Grand Cayman $272-$277 r/t [April] (very limited dates) â JetBlue JetBlue has round-trip flights from Austin (AUS) to Grand Cayman (GCM) for $272 with a connection. Flights in April. Departures on Thursday, Saturday, and Sunday. Origin/Destination reversible. JetBlueâs âBasicâ fares only allow a small personal item (17 x 13 x 8 inches), like a Jansport SuperBreak backpack without a fee. A regular sized carry-on bag will incur a bag fee. Click for more details and booking links Cheap Flights: Austin to/from Grand Cayman $272-$277 r/t [April] (very limited dates) â JetBlue . | 