| Cheap Flights: Austin to/from Cozumel $223-$238 r/t [December-January] â United / American United has round-trip flights from Austin (AUS) to Cozumel (CZM) for $223-$238 with a connection. Flights December to January. Weekends available. Origin/Destination reversible. American has a few matched dates available, but the majority is on United. Click for more details and booking links Cheap Flights: Austin to/from Cozumel $223-$238 r/t [December-January] â United / American . | 