If your ESTA authorisation is valid on the start date of your trip but expires during your stay in the United States, i.e. before your return date, you do not need to make a new application covering your entire stay.
However, it is clear that your ESTA cannot be used for future trips to the United States and you will have to renew your application for future stays in order to benefit from a new 2-year authorisation period.
To apply for a new ESTA, you must fill in an online form again via a site like ours. You will then have to answer all the questions asked of you, as if it were your first application. You will also have to pay the fees by credit card in order to validate your questionnaire.
⚠️ Take care when travelling to a destination other than the United States but with a stopover or transit at a US airport.. In this particular case, and if your journey involves a stopover or transit to and from the airport, your ESTA authorisation must be valid for the duration of your stay.
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