How to reach Sumbawa

Sumbawa is considered somewhat remote even by Indonesian standards, and an overland-and-sea journey from Bali takes 15 hours beginning in Singaraja, Bali, and ending up in Poto Tano, the port on the western side of Sumbawa.
Only the cities of Sumbawa Besar on the western side of the island and Bima on the eastern side of the island have regular air service. Merpati and Transnusa fly to both cities from Denpasar (Bali) and Mataram (Lombok) on Western-made ATR-42 turboprops about four times a week. Sekongkan also has an airport, but flights have been stopped for an indefinite period after a small airline called Tropical Air ceased operating.
To get to Sumbawa from Bali most people take the ferry from Bali to Lombok, travel overland to the eastern seaport in Lombok (Labuhan Lombok) and then take another ferry to Sumbawa, ending up in Poto Tano.
In the other directions, ferries from Labuanbajo, Flores travel to Sape. These do not leave every day and you may face a several day wait for the next one.