Mainland ferries can often look fully booked on the website
However cancellations and changes are very common and there is always a good chance you will be able to travel when you want to.
Call Calmac Islay on 01496 730172 (option 2)
Book onto the closest ferry to the one you want (travel changes are free of charge)
Call Calmac regularly to see if availability has become free on your desired ferry
Just turn up at Kennacraig! There is a very good chance you will get on, even if you are told the ferry is fully booked when you call. Be at the ferry at least two hours before departure if you choose this option.
Call Calmac at Port Ellen office 01496 730172 (option 2)
Come as a foot passenger and get your car put on a different sailing or use public transport when you get here.