As a United States Citizen petitioner, you can sponsor your fiancé and file a petition with the USCIS to request a K-1 visa. It should be noted that you must be a U.S. Citizen and not just a lawful permanent resident. After filing the petition and providing the required evidence, the USCIS will take about six (6) to nine (9) months to decide on the petition. The petition requires a significant amount of evidence that needs to be submitted to prove the bona fides of the relationship and intent to marry one another within ninety (90) days of entry to the United States.