The basics
ESTA stands for Electronic System for Travel Authorization. It is an online pre-screening check run by U.S. Customs and Border Protection for travellers from Visa Waiver Program countries. It is not a visa — it is permission to board a plane or ship bound for the United States.
Why it matters
Without an approved authorization, an eligible traveller cannot legally begin the journey to the United States.
Carriers verify your authorization electronically against your passport. No approval on file means you are denied boarding at your departure airport.
For short tourism, business or transit trips, an ESTA lets eligible travellers skip the embassy appointment, the interview and the visa paperwork entirely.
Your details are screened against U.S. law-enforcement and security databases before departure, which is why authorization must be in place ahead of travel rather than on arrival.
Good to know
It authorizes travel, not entry. The final decision is made by a border officer when you arrive at a U.S. port of entry.
It is tied to your passport. A valid e-passport with a biometric chip is required, and a new passport means a new ESTA.
It covers tourism, business and transit. Paid employment, journalism assignments, permanent study and long stays require a visa instead.
Every traveller needs one. Including infants and children, regardless of whether they travel on a family booking.
Apply well before departure. Most decisions come through within 72 hours, so applying at the airport is a risk not worth taking.
Visa Waiver Program
Citizens and nationals of Visa Waiver Program countries need an ESTA to travel to the US without a visa. If your country is not on the list, you need a US visa instead.
Know the difference
| ESTA | US Visa | |
|---|---|---|
| Eligibility | Visa Waiver Program countries only | All nationalities |
| Validity | 2 years, multiple entries | Varies by visa type |
| Maximum stay | 90 days per visit | Up to 6 months (B-2) |
| Processing time | Usually within 72 hours | Weeks to months |
| Interview | Not required | Required in most cases |
| Work permitted | No | With the appropriate visa type |
| Study permitted | Short recreational courses only | With a student visa (F-1) |
| Extending your stay | Not possible | Possible in some categories |
| Where you apply | Online | In person at a US embassy or consulate |