The US Preclearance (USCBP) facility at Terminal 2 in Dublin Airport is a purpose built facility that allows US bound passengers to undertake all US immigration, customs and agriculture inspections at Dublin Airport prior to departure.
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Preclearance operates at 15 locations worldwideWith Preclearance, travelers then bypass CBP and Transportation Security Administration (TSA) inspections upon U.S. arrival and proceed directly to their connecting flight or destination.
“Preclearance” refers to an arrangement between two countries that allows customs and immigration officials from the country of destination to be located in the country of origin in order to clear or deny the admission of travellers or goods to the destination country.
Irish citizens require an ESTA or visa to enter the US. In advance of travel, an ESTA (Electronic System for Travel Authorisation) application can be made to determine the eligibility of visitors to travel to the US under the Visa Waiver Program (VWP). A valid passport is required for travel to the US.
Usually, you go through customs when you exit the airport at your final destination. However, if you have a layover in a different city in your destination country, you may need to go through customs before your connecting flight.
An immigration officer can refuse permission for you to enter Ireland, even if you have a visa or residence permission in Ireland. Ireland is not part of the Schengen Area. This means that you must have a national passport or national identity card to enter Ireland from the EEA.