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The Electronic System for Travel Authorization is an automated system that determines the eligibility of visitors to travel to the United States under the Visa Waiver Program. ESTA was mandated by the Implementing Recommendations of the 9/11 Commission Act of 2007 for travelers from VWP countries arriving in the U.S. by air or sea. ESTA only authorizes travel to a U.S. airport or port of entry, but admissibility into the United States is determined by a U.S. Customs and Border Protection officer upon arrival. The ESTA application collects biographic information and answers to VWP eligibility questions.
ESTA applications may be made at any time, but travelers are encouraged to apply at least 72 hours prior to travel. ESTA has an application fee of $4, and if approved, an additional fee of $17 is charged, for a total of $21. After approval, the authorization remains valid for two years, or until the passport expires if earlier, for multiple trips during that period. Each person traveling under the VWP, regardless of age, needs a separate ESTA.
ESTA is also needed for travel under the VWP to the U.S. territories of Puerto Rico, U.S. Virgin Islands, Guam and the Northern Mariana Islands, but some of these territories have separate waivers for certain nationalities that do not require ESTA. Travel to American Samoa requires a different electronic authorization or permit.
ESTA is not needed when arriving by land from Canada or Mexico, but an I-94W form must be completed. The U.S. government plans to require ESTA also for entry by land from October 1, 2022.