Flights to Montenegro are in pretty short supply, but Montenegro Airlines (w http://www.montenegroairlines.com) flies to Podgorica and Tivat (near Kotor) from several European destinations. The state is also easily reached overland from any of its neighbouring countries. From Croatia, there are buses along the coast from Dubrovnik – also home to the closest budget flights – and there are a couple of services from Split too; some of these will require a bus change after a short walk across the border. From Serbia, there are several daily buses between Belgrade and the Montenegrin coast, via Podgorica; daily trains – including a night service – also run from Belgrade to Bar along the same route. From Bosnia-Hercegovina there are direct buses to Podgorica from Trebinje and Sarajevo.
Perhaps the most romantic way to arrive in Montenegro is by ferry from Italy. Between April to September, Montenegro Lines (w http://www.montenegrolines.net) runs between two and six weekly services to Bar from Bari (from €50).