Check Ireland's visa requirements. For those visiting London on a British visa, the British visa will not be valid in Ireland and you may need an Irish visa. Americans traveling as tourists or on business in Ireland do not need a visa, but are required to travel on a valid passport.
Take your luggage to a train station in London to purchase your tickets.
Ask the ticket agent for a SailRail ticket to your destination in Ireland. This will cover the train from London to the port city, the ferry ticket to Ireland and the remainder of the train journey to your destination in Ireland.
Choose your route to Ireland. Stena Ferries and Irish Ferries cross the Irish Sea from Fishguard and Holyhead on SailRail tickets.
Pay the ticket agent and pick up your tickets. See the Resources section if you would rather book the tickets online ahead of time.
Check the visa requirements for your trip to Ireland. Always bring your passport when traveling internationally. Americans do not need a visa to enter Ireland as tourists or on short business visits, but if you anticipate an extended stay, the entry requirements will differ.
On your airline search, enter your flight dates, the London airport from which you wish to fly and the airport in Ireland where you wish to land. London airports have numerous daily flights to Dublin, Cork, Kerry, Knock, Shannon, Waterford, Sligo and Donegal.
Select your airline. If you are after budget travel, Ryanair, Aer Lingus and Aer Arann all offer good deals if you want to fly from Stansted, Luton or Gatwick. However, the more traditional carriers in the UK, like BMI and British Airways, also have flights to Ireland from Heathrow and Gatwick.
Purchase your tickets to Ireland.
Bring your luggage and passport to the airport on the day of your flight. Check in online ahead of time, or with the check-in desk at the airport.
