Under the Visa Waiver Program (ESTA), you can’t extend your stay beyond 90 days or change status from within the U.S. If you overstay, even by a few days, you could face serious consequences, including a future travel ban.

If a true emergency prevents you from leaving on time, you can try contacting USCIS and requesting Satisfactory Departure, which may grant you up to 30 extra days. It’s only approved under urgent, documented circumstances, and must be requested before your authorized stay expires.

If you're uncertain about your timeline, it may be safer to leave the U.S. as planned and return later with a new ESTA authorization or different visa, depending on your future plans. This helps you avoid issues at future ports of entry.