• Passport
  
  
• One photograph
  
  
• Original DS-156, nonimmigrant visa application form.
  
  
• Original DS-157, supplemental nonimmigrant visa application form.
  
  
• Visa Fees
  Application fee and service charge to be paid in advance at participating HDFC bank before taking an appointment.
  Visa fee receipt issued by HDFC bank with two bar code stickers to be carried to the consulate at the time of interview.
  
  
• Interview appointment letter.
  Sample
  
  

• Proof of permission to enter the country of your final destination such as passport with a valid visa, or an evidence that a visa is not required.
  
  
• Proof of the purpose of your visit to the foreign destination.
  
  
• A common carrier (flight or ship) ticket or other proof of transportation arrangement to final destination.
  
  
• Financial documents to show that you have adequate funds to cover the cost of your transit journey.
  
  
• Evidence of a residence abroad to which you intend to return at the end of the stay in the US. This can be established by evidence of family, professional, property, employment or other ties and commitments to some country other than the US, through sufficient evidence to compel you to return there at the conclusion of your stay.
  
  
• Consular officer may require additional documents at the time of interview to verify the purpose of obtaining the visa. It is not possible to predict what additional documents may be required.
  
  
• Additional documents for HIV positive persons:
  • A letter from the applicant's physician describing the current state of the health, the risk to the US public health and the risk of spread of infection.
    
    
  • A letter describing the purpose of trip (essentially transiting the US), anticipated travel dates in and out of the US, and the date by which you will confirm travel arrangements. The letter should also indicate the person will be covered by medical insurance during his/her stay.
    
    
• Prior arrests/convictions in the US:
  Obtain court records from the court(s) in which you were tried if you were arrested and convicted of an offense in the US. Such court records must show the nature of the offense(s) committed, the section(s) of law contravened and the actual penalty imposed.
  
  If your arrest did not result in a conviction, or if you are unable to obtain a copy of the court records, submit a sworn affidavit stating the arrest location (state and county), and the reason for the arrest.
  
  If your arrest resulted in a conviction, the affidavit must describe the nature of the offense committed, section of the law contravened and penalty imposed by the court(s).
  
  

You must apply for C-1 transit visa at the nearest US embassy or consulate. All applicants over 14 years to 79 years of age must apply in person and must schedule an appointment before visiting the US embassy or consulate. Applicants under the age of 14 and those 80 years and above may apply for a transit visa by mail.

Application procedures vary depending upon the consulates in different countries. If you are applying for a transit visa in India, you can find detailed application procedure. Processing times can vary a lot in different countries and there are delays of several months in places like India before you can get the visa appointment. It is wise to plan very early because of constant heavy demand for US visas.

If you have a medical ineligibility, have been denied entry into or deported from the United States, require additional administrative processing, or if you are a temporary resident of the the country where you are applying for transit visa, your application may be delayed further.

If you are being deported by another country by transiting through the US, either with or without an escort, you will not be admitted as a transit without visa. You may be paroled for the purpose of transiting the US.