Upvote:3
The distance from the airport to the ferry port is about 12 km. Rome2Rio lists the options. Bus is the least expensive, with the Dublin bus about €3.50, and the Airlink bus €7. While both indicate it takes, 15 minutes, I’ve found it can more like 25-30. A taxi will be as quick, and cost about €20-25. There is a dedicated shuttle service through you can book.