The passenger ferry to Tory Island sails from Magheroarty on the Donegal mainland and takes about 45 minutes across open Atlantic water. Schedules depend on tides, daylight, and weather, so check the operator before setting out and do not plan a tight same-day connection.
There are no cars for visitors. Park at Magheroarty, bring what you need for the day, and assume the island will have limited shops and patchy phone signal.