UK nationals are required to have a valid ETIAS travel authorisation if they travel to any of the European countries requiring ETIAS for a short-term stay (90 days in any 180-day period).
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How Long Can UK Citizens Stay in the EU After Brexit? After Brexit, you can stay in the EU, Iceland, Norway, and Switzerland without a visa for up to 90 days in a 180-day period. For any trip longer than 90 days, you must apply for the appropriate visa and residence permit.
Requirements to enter Greece from the UKBritish citizens can visit Greece for up to 90 days without a visa. Tourists and business travellers can enter the country using their valid UK passport. From 2024, British travellers will also need an ETIAS authorisation to visit anywhere in the Schengen area, including Greece.
Visa Waiver Program travelers are required to apply for and receive an approved travel authorization via ESTA to board a plane or vessel bound for the United States. (A travel authorization via ESTA is not a guarantee of admission into the United States.