Do children under five travel free as foot passengers on the Rathlin Island ferry?

Yes. The Department for Infrastructure lists free ferry travel for children under five on the Ballycastle–Rathlin service.

Children aged five to 15 have a separate child fare. Bicycle and vehicle carriage are charged under separate categories, so free travel for a young foot passenger does not make other items free. Check the official fare table before booking travel to the island.