Budva to Dubrovnik
The fast ferry from Budva to Dubrovnik used to be the most convenient way of travelling between the cities, unfortunately the company Forline who operated the ferry route, stopped doing so after 1 season of operation.
As long as no new ferry is introduced, the two alternatives are either taking the bus from Budva to Dubrovnik bus station or to book a private transfer. In either case prepare yourselves for some potential waiting at the border between Montenegro and Croatia.
NOTE: If you are going to Dubrovnik airport from Budva (Kotor or Herceg Novi) and wish to travel directly, the only affordable option is take a private transfer.