Uig to Lochmaddy Timetable and Fares- https://www.calmac.co.uk/summer-timetable/uig-lochmaddy
Lochboisdale to Mallaig Timetable and Fares- https://www.calmac.co.uk/summer-timetables/mallaig-oban-lochboisdale#9%20Apr%20-%2015%20Oct
Pre booking of cars is essential.
Both sailings are in open water and can be quite lively, even in summer. If it is too bad sailings will be cancelled or retimed, sometimes earlier than scheduled and/or diverted and the Lochmaddy service combined with the Harris service leading to an extended passage time. Keep a close eye on CalMac updates.
In particular note that Mallaig is a difficult berth, and sea conditions can be too bad. In those circumstances sailings are rerouted to Oban via the Sound of Mull. Even in Summer this is not especially unusual.
Once you are in the shelter of Mull it's always calm.
Sometimes such re-routed sailings are combined with the Castlebay (Barra) sailings. This is an extended passage time with or without a Castlebay call, and depends on berth availability at Oban.
This is not to discourage you in any way, but to give you realistic expectations.
