I got this from
http://manila.usembassy.gov/The K visa is a visa for a fiancé(e) of a U.S. citizen who will travel to the United States to marry and take up indefinite residence after marriage. To qualify for a fiancé(e) visa, the following criteria must be met:
one party is a U.S. Citizen;
both parties are legally free to marry; and
the marriage will take place within 90 days of the fiancé(e) entering the United States on the fiancé(e) visa.
U.S. citizens who wish to bring their fiancé(e) to the United States on a K visa must first file a petition with USCIS in the United States.
The K visa does not automatically grant U.S. citizenship or lawful permanent resident (LPR) status to the beneficiaries. Those who qualify for K visas will be able to join their partners in the United States as a nonimmigrant, without the potentially long period of separation during the petition process. Once married, they will need to adjust their immigration status in the United States to become lawful permanent residents.
Application Procedures for the K Visa
STEP 1: File the Petition: File the I-129F petition with the U.S. Citizenship and Immigration Services (USCIS) office that covers your permanent place of residence. The Form I-129F is available online. The petition must be filed in the United States.
STEP 2: USCIS approves the petition: Once the petition is approved, USCIS sends it to the National Visa Center (NVC) to collect further required documents. NVC then forwards the petition to the Embassy in Manila.
NOTE: Approval of a visa petition does not necessarily mean a visa will be issued. Only a consular officer at the Embassy may determine a person’s eligibility to receive a visa.
STEP 3: The applicant is notified: K visa applicants, who have been notified by the Embassy to prepare for their interview, must pay the visa application fee before they can schedule a visa appointment via the online appointment website or the Visa Information and Appointment Service.
STEP 4: Apply for the visa: After the applicant pays the non-refundable application/processing fee and completes the required medical examination at St. Luke's Medical Center Extension Clinic, he/she appears at the Embassy for the scheduled visa interview with all the required documents.
The consular officer adjudicates the application based on the visa interview, documents submitted by the applicant and any relevant information available to the Embassy. The consular officer determines the applicant’s eligibility to be issued the K visa. If the application is approved, the visa will be delivered to the applicant's residence by a guaranteed courier service. If the consular officer determines that the applicant is not eligible for visa issuance, this will be explained to the applicant who will be provided a written refusal sheet that informs her/him:
How the visa refusal may be overcome with additional documentation or information;
To await notification from the Embassy if the case will require further review; or
The basis for the determination of a visa ineligibility under U.S. immigration law and if a waiver of ineligibility is available.