| Cheap Flights: Austin to Dubrovnik, Croatia $505 r/t [July-August] â Delta Delta has round-trip flights from Austin (AUS) to Dubrovnik (DBV) for $505 with a connection. Flights July to August. 7-day minimum stay required. Croatia is reopen to tourism. Travelers need proof of paid-in-advance accommodations, and either proof of vaccination or a negative COVID test for entry. Fill out form on Croatian web-portal before arriving. Click for more details and booking links Cheap Flights: Austin to Dubrovnik, Croatia $505 r/t [July-August] â Delta . | 