ESTA (Electronic System for Travel Authorization)

ESTA is run by US Customs and Border Protection (CBP) for travelers from Visa Waiver Program countries, such as the UK, France, Japan, and Australia, who visit the US for tourism or business for up to 90 days without a visa. Travelers apply online before boarding a flight or ship to the US, and an approved ESTA is typically valid for two years or until the passport expires, whichever comes first.

ESTA is not for US citizens. Americans, including dual citizens, enter the US on a US passport. Where ESTA matters to American travelers and companies is when inviting overseas colleagues, clients, or family to the US: confirm their eligibility early, because some travelers, such as those who have visited certain countries since 2011, must apply for a visa instead.

Approval is not a guarantee of entry; CBP decides admission at the border. Apply only through the official CBP website, since look-alike sites charge extra. US citizens heading abroad may need similar systems elsewhere, such as the UK ETA.