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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There are no post-arrival testing or quarantine requirements for travellers to Ireland. Any individual that develops COVID-19 symptoms while in Ireland should follow the HSE guidance in relation to isolation and undertaking antigen or PCR testing as appropriate.
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.
Customs and immigration are usually required at the connecting airport for international flights. You don't always have to for domestic flights. In most cases, passengers on layover flights must clear customs and immigration at the first point of entry.
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.
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 best time to visit Ireland is during the shoulder season (May, September and October). During these months, you'll find less crowds along with cheaper flight and accommodation prices. These months experience mild temperatures, plenty of dry spells and there's a packed festival calendar.