Final Thoughts. If you are wondering “do you go through customs when leaving the U.S.”, the answer is no. All countries have customs inspection procedures at borders and international airports. However, only passengers entering a country are subject to customs inspection.
You'll need to clear customs and immigration. Next, you'll recheck your luggage for the domestic flight. Finally, you'll need to go through Transportation Security Administration screening.
The US Preclearance (USCBP) facility 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.
If you are travelling from Dublin to the US on your connecting flight you can use the US Preclearance facility in Dublin and will not have to go through US customs when you land. If you fly from Dublin to another airport outside of the US then you will not use US Preclearance.
We're delighted to be able to offer you the ultimate time-saving service – U.S. pre-clearance facilities at Dublin airport from Terminal 2. This means that if you're flying to the U.S., you can clear not only U.S. immigration, but also full U.S. customs and agriculture controls.
If you are coming to Ireland from a country outside the EU with €10,000 cash or more you must present a completed cash declaration form (pdf) to the Customs at the airport or seaport when you enter Ireland. If you fail to submit a declaration your cash may be detained by Customs and you could be subject to penalties.
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.
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.
Transferring between an international and domestic flight is more complicated than a domestic-to-domestic connection. Here's what you're expected to encounter: If you checked a bag, you'll have to collect it from baggage claim from the international flight. You'll need to clear customs and immigration.