| Cheap Flights: Austin to/from Cozumel $253-$268 r/t [March-May] â United United has round-trip flights from Austin (AUS) to Cozumel (CZM) for $253-$259 with a connection. Flights March to May. Weekends available. Origin/Destination reversible. A negative COVID test result is required for return. Carry-on bag and seat selection is allowed without a fee. Click for more details and booking links Cheap Flights: Austin to/from Cozumel $253-$268 r/t [March-May] â United . | 