Entry requirements are as for mainland USA: British citizens require a valid passport for travel to Puerto Rico. Under the Visa Waiver Programme (VWP), most British citizens do not require a visa for holiday, transit or business purposes providing their passports are machine-readable, the stay does not exceed 90 days and a return or onward ticket is held. Note: Holders of UK passports with the endorsement British Subject, British Protected Person, British Dependent Territories Citizen, British Overseas Citizen or British National (Overseas) Citizen do require a visa.
Irish passport holders qualify for the Visa Waiver programme if they hold a valid, machine-readable passport, and may stay up to 90 days without a visa.