My fiance is a 45 year old American with a University of Las…

Hello, my name is Judith. Thank you for this opportunity to answer your questions. I have 34 years experience as a licensed immigration attorney.

She would need t file a fiance visa petition for you.if you are going to marry in the Us.

The I-129F will cost $340 plus a $350 fee for the visa processing fee. After she enters the U.S., then you have to marry and then you have to pay $1070 for the I-485

Unfortunately, you will have to be patient because it will take a total of 6-10 months for you and she to go through the arduous process of her immigrating.
She will file form I-129F with the USCIS here in the US at the lockbox (PO Box) as per the instructions.
You must include with the form a G-325A for you and she along with 2 passport style photos of each of you.
You can find those forms and instructions at this link
http://www.uscis.gov/forms

Once your petition is approved (it will take 3-5 months) she will be notified and the petition will be sent to the National Visa Center. You will then go online to begin the visa process by submitting the DS-160 & 156K Visa Application.
After that is received the USCIS will request your background/security check be done by the FBI you will then receive your instructions for your medical and visa appointment.
You will be told what documentation to bring.
After the interview you will be told to leave your passport and the immigrant visa packets will to sent back to you withing 2 weeks at which time you may travel to the US. You have 4 months to use the visa.

Here is a great link to a flowchart with timelineshttp://www.visajourney.com/content/k1flow

http://www.uscis.gov/files/article/A2eng.pdf

http://travel.state.gov/visa/immigrants/types/types_2994.html

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Judith