Prcanj is about 68km (90 minutes drive) from Dubrovnik airport via the ferry at Kamenari (Montenegro) (4 euros per car) or about 85km if driving round the bay via Kotor (about 2 hours). British Airways, EasyJet and Croatia Airlines all fly to Dubrovnik. Tivat airport is about 17km (25 minutes drive) which is serviced by Montenegro Airlines as is Podgorica airport (about 80km or 2.25 hours drive). I recommend Best Buy Budget car hire at Dubrovnik Airport (cheap but reliable and very friendly) but you need to pre-book.