Bringing a Fiancé(e) or Spouse to the U.S.
A K-1 visa is a visa issued to the fiancé or fiancée of a United States citizen to enter the United States. A K-1 visa requires a foreigner to marry his or her U.S. citizen petitioner within 90 days of entry. Once the couple marries, the foreign citizen can adjust status to become a lawful permanent resident of the United States (Green Card holder). Although a K-1 visa is legally classified as a non-immigrant visa, it usually leads to important immigration benefits and is therefore often processed by the Immigrant Visa section of United States embassies and consulates worldwide. If a K-1 visa holder does not marry his or her U.S. citizen petitioner within 90 days of entry, then he or she must depart the United States within 30 days.
A K-3 visa is for the foreign-citizen spouse of a United States (U.S.) citizen. The U.S. citizen spouse applies for a nonimmigrant K-3 visa overseas, in the country where the marriage took place, on behalf of the foreign-citizen spouse, who enters the United States to await approval of the immigrant visa petition. K-3 visa recipients subsequently apply to adjust status to a permanent resident (LPR) with the Department of Homeland Security (DHS), U.S. Citizenship and Immigration Services (USCIS) upon approval of the petition. Eligible children of K-3 visa applicants receive K-4 visas. Both K-3 and the K-4 visas allow their recipients to stay in the United States while immigrant visa petitions are pending approval by USCIS.