Esta -

: It is highly recommended to apply at least 72 hours before departure. Real-time approvals are no longer guaranteed, and arriving at the airport without an approved ESTA will likely result in being denied boarding.

: Once approved, an ESTA is generally valid for two years or until your passport expires, whichever comes first. : It is highly recommended to apply at

: The current application fee is $21 when applied for directly through the official site. : It is highly recommended to apply at