Ullapool Harbour provides a vital link to the Western Isles with the provision of a ro-ro lifeline ferry service crossing the Minch to Stornoway.  The winter timetable provides 2 crossings a day Mon-Sat for the Isle of Lewis, carrying passengers, cars and light commercial vehicles, in addition 2 further crossings are added to the service on Wednesdays and Fridays during the summer months. A dedicated freight service runs nightly on the Muirneag carrying mainly heavy goods traffic with provisions for the island communities, both ferry services are run by Caledonian MacBrayne.

Other regular commercial traffic includes the contracted tug Anglian Prince, on permanent duty for the Marine Coastguard Agency with responsibility for patrolling the North Minch and if necessary escorting cargo vessels through the area.  The Marine Scotland vessels Scotia, Alba Na Mara along with the fleet of fishery patrol vessels are regular visitors to the harbour for crew and equipment changes.