Visa requirements for US passport holders
US passport holders can visit the United Kingdom for 180 days with a travel authorization.
The 180 days run from each arrival.
Estero counts these days on iPhone.
Every destination for US passport holders
Visa-free144
Visa on arrival30
Travel authorization8
eVisa28
Visa needed19
Free movement5
Kinds of entry
Visa-free entry needs only the passport. A visa on arrival is issued at the border, sometimes for a fee.
A travel authorization, such as the US ESTA or the UK ETA, is approved online before the flight. It is not a visa. An eVisa is a visa applied for online before travel. Any other visa is applied for at an embassy or consulate.
Sources
Entry for US passports follows Wikipedia, Visa requirements for United States citizens (IATA Timatic), checked October 7, 2026. Lengths of stay come from each country's own rules. Every source is listed on the sources page.
The same rules run inside the Estero app. Entry is decided by the border officer. Corrections go to support@estero.app.
Every day abroad, counted on iPhone.