Who is required to apply for ESTA?
All eligible nationals or citizens of VWP countries who plan to travel to the United States for temporary business or pleasure under the VWP are required to receive an authorization through ESTA prior to boarding a U.S.-bound airplane or vessel. Accompanied and unaccompanied children, regardless of age, are also required to obtain an independent ESTA approval. A third party, such as a relative or travel agent, is permitted to submit an ESTA application on behalf of a VWP traveler.
Frequently Asked Questions about the Visa Waiver Program (VWP) and the Electronic System for Travel Authorization (ESTA) - CBP.gov
Donc non, c'est uniquement si tu arrives aux US par avion ou bateau. Pas besoin de l'ESTA pour faire le tour du poteau donc