The US ESTA, explained

By the Viamo editorial team · Editor Terje Moy · Last updated July 2026 · 5 min read

The Electronic System for Travel Authorization — ESTA — is a pre-travel clearance that lets citizens of Visa Waiver Program (VWP) countries visit the United States for up to 90 days for tourism or business without applying for a full visa. It is fast to apply for, but getting it wrong has real consequences. Here is how it works.

Who can use the Visa Waiver Program

The VWP is open to citizens of countries that have a reciprocal visa-free agreement with the United States. The list includes most Western European countries, Australia, New Zealand, Japan, South Korea, Chile and others — over 40 countries in total as of 2026, though the exact list changes periodically. If your country is on the list and your passport is biometric, you may be eligible to apply for ESTA.

Being a citizen of a VWP country does not automatically make you eligible for ESTA. You are disqualified if, among other things, you:

• Have previously been refused entry to the US or refused a US visa.
• Have been arrested or convicted of a crime, even if charges were later dropped.
• Have visited or been dual nationals of certain countries (Iran, Iraq, North Korea, Syria, Cuba, Libya, Somalia, Sudan, Venezuela, or Yemen, as of current rules — check the current DHS list).
• Are travelling for purposes beyond tourism or business (work, study, journalism, or certain other categories).

If you are disqualified from the VWP for any reason, you must apply for the appropriate US visa at a US Embassy or Consulate instead. Attempting to enter the US under ESTA when you are not eligible is a serious matter.

How to apply for ESTA

The application is completed online at esta.cbp.dhs.gov. You will need:

• A valid biometric (e-Passport) with a machine-readable zone.
• Your travel dates and US address (a hotel is fine, or your host's address).
• A payment method for the application fee.
• Answers to eligibility and security questions.

Most applications receive a decision of Authorization Approved within minutes, though the system can take up to 72 hours. You should apply at least 72 hours before departure, and ideally before booking non-refundable travel in case of any complications.

A single ESTA authorisation covers multiple trips to the US within its two-year validity (or until your passport expires, whichever comes first). You do not need to reapply for each visit. However, any change in your circumstances — a new passport, an arrest, or a visit to one of the countries that disqualifies you — means you must reapply.

What ESTA covers (and what it does not)

ESTA authorises you to travel to the United States for tourism, visiting family, or certain business activities (meetings, conferences, negotiating contracts — but not taking up employment). It does not cover:

• Work or employment of any kind, including self-employment or freelancing.
• Study courses longer than 18 hours per week.
• Journalism or work as a foreign media correspondent.
• Any activity that generates income from a US source.

If your trip involves any of these, you need the appropriate visa — a B-1 for some business activities, an F or M for study, an O or P for performance, and so on. A US Embassy or Consulate can advise.

How long you can stay

The ESTA permits stays of up to 90 days per visit. Unlike the Schengen 90/180 rule, the US VWP limit is not calculated on a rolling window in the same way — but US Customs and Border Protection (CBP) officers do take note of the frequency and length of your visits. Spending most of the year in the US on repeated 90-day VWP trips is likely to raise questions and can result in denied entry. If you are making frequent or extended trips, a longer-stay visa may be more appropriate.

The 90-day clock starts on your day of entry. Overstaying — even by a day — can result in being barred from using the VWP in future, and potentially from entering the US at all for a period of time.

Arriving in the US

On arrival, all visitors are processed by CBP. You will go through:

• Biometric screening — fingerprints and a photograph at the border. This applies to all visitors, including VWP travellers.
• Declaration form — either a paper form on the plane or via the Automated Passport Control kiosk at the airport.
• CBP officer interview — where you may be asked about your trip, your work and your contacts in the US. Standard questions for a short visit are straightforward.

ESTA approval does not guarantee entry — CBP makes the final decision at the border. The officer can deny entry if they are not satisfied that your visit is legitimate or that you intend to leave within 90 days.

If you are not eligible for ESTA

Citizens of countries not in the VWP, or VWP citizens who are disqualified, need a US visa. The most common short-stay visitor visas are the B-1 (business) and B-2 (tourism), usually applied for together as a B-1/B-2. These are applied for at a US Embassy or Consulate in your home country. Processing times vary considerably by country and season — check current wait times early, as they can be many months at busy posts.

Frequently asked questions

How much does ESTA cost?

The US government charges a fee per application; check the current amount at esta.cbp.dhs.gov, as fees can change. Apply only on the official site — third-party sites charge additional service fees on top.

How early should I apply for ESTA?

Apply at least 72 hours before your flight. Most approvals come within minutes, but apply earlier if you want certainty before booking non-refundable travel.

Does ESTA expire between trips?

An approved ESTA lasts for two years from approval, or until your passport expires — whichever comes first. You can make multiple trips to the US within that period without reapplying, as long as your circumstances have not changed.

Can I extend my stay beyond 90 days on ESTA?

No. The 90-day limit is firm for VWP visitors. You cannot extend or change status within the US on ESTA. If you need a longer stay, apply for a visa before you travel.