Belfast Airport Passports US citizens will need to show a valid passport upon arrival in the Republic of Ireland or Northern Ireland. Passports must at least be valid for the duration of your stay, but validity for six months after your arrival date is recommended. Useful Links 1. Department of Foreign Affairs and TradeThe Irish government website gives information on visas and passports, and contact details for embassies. 2. Citizens Information BoardIreland’s statutory body is a great source of information about what you need to travel to Ireland. 3. NI Direct: VisasThis is where you will find information and advice on visa requirements for Northern Ireland Visas US citizens may visit the Republic of Ireland or Northern Ireland without a visa for up to 90 days. However, please contact the appropriate consulate if you intend on working, studying, or staying longer than 90 days Recommended reading Travel Essentials Use our travel essentials checklist: everything you need to know from pets to public holidays, languages and more. Customs and Borders Before you get on that plane, take a look at the customs and borders procedures you can expect when you step off. Travelling in Ireland Whether it's by air, road or sea, we've got the lowdown you'll need on any mode of travel around the island.