Road transport from Estonian mainland to Hiiumaa involves a 90-minute (28 km) ferry crossing from Rohuküla to Heltermaa, which is 25 km by road from Kärdla. There are about 10 ferry departures a day. In the summer weekends, getting car space on the ferry usually requires advance booking. There are about 2 scheduled buses a day between Tallinn (the capital of Estonia) and Kärdla.
There are no scheduled passenger boats directly to Kärdla.
Kärdla is served by Kärdla Airport, with regular flights to Tallinn.
Kärdla town itself is small enough to get around on foot. Bicycle rental is available and there is a good bicycle path built from Kärdla towards Kõrgessaare
