Can I apply for ESTA on day of travel?
Can I apply for ESTA on day of travel? When should I submit an application through ESTA? Applications may be submitted at any time prior to travel to the United States. The Department of Homeland Security recommends that travel authorization applications be submitted at least 72 hours prior to travel.
Is the ESTA mandatory?
Visa Waiver Program travelers are required to apply for and receive an approved travel authorization via ESTA to board a plane or vessel bound for the United States. (A travel authorization via ESTA is not a guarantee of admission into the United States.