A visa is valid until its expiration date, unless it has been cancelled or revoked. You may travel to the United States any time before your visa expires, even up to the day it expires! There is no six-month validity rule for U.S visas.
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Traveling Outside the U.S. While Your Application Is PendingU.S. Citizenship and Immigration Services (USCIS) considers leaving the country while your application is still under review as abandoning it, resulting in immediate denial. U.S. immigration can be complex and confusing.
Passport valid for travel to the United States – Your passport must be valid for at least six months beyond your period of stay in the United States (unless exempt by country-specific agreements). Each individual who needs a visa must submit a separate application, including any family members listed in your passport.