How can I extend my tourist visa?

You can apply to extend your tourist visa by completing and filing Form I-539 with the USCIS. A tourist visa can only be extended for a total period of 1 year. Be sure to include a cover letter with you petition explaining why you need an extension. You should also include evidence that you have sufficient financial resources to support yourself while you are in the U.S. and that you have a return ticket to your home country.