List of UK to Ireland ferries.
Irish Sea ferry companies

Stenaline UK to Ireland Ferries.
Stena Line operate the following routes between Ireland and the UK : 
·  Dublin Port to Holyhead and return
·  Dun Laoghaire to Holyhead and return
·  Rosslare to Fishguard and return.
·  Belfast to Stranraer and return
·  Larne to Fleetwood and return

Norfolkline UK to Ireland.
Norfolkline operate more than 50 sailings each week from Ireland and the UK, offering services between:

• Belfast to Liverpool and return.
• Dublin to Liverpool (Birkenhead) and return.
  

P&O UK to Ireland.
P&O operate daily ferry services between Dublin Port and Liverpool as well as services between Cairnryan / Troon in Scotland and Llarne in Norther Ireland

• Cairnryan / Troon to Larne and return.
• Dublin Port to Liverpool and return.