Tourist Visa in the USA Expires – What to Do: I-94, I-539 Extension, Overstay, and 3/10 Year Bars (2026)
The legality of your stay is determined by the I-94 date, not the visa validity – check it at i94.cbp.dhs.gov; ESTA has no extensions (emergency satisfactory departure up to 30 days), while for B-2 you file I-539 (470/420 USD) preferably 45 days before the deadline; overstaying more than 180 days results in a 3-year ban upon departure, over a year leads to a 10-year ban, and ANY overstay invalidates your visa and permanently closes ESTA.