If you came to the United States on a nonimmigrant visa and you want to extend your stay you must apply with USCIS before your authorized stay, denoted on your admission stamp or paper Form I-94, expires.
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Thai Visas are issued for single or multiple entries, usually for a period of thirty days to a year. In the case where a visa is issued for a single-entry, if you leave the country, you cannot re-enter, even if you have not exhausted the number of days you were given. This is where a Thailand Re-Entry Permit comes in.
If you have already overstayed, our advice is different depending on length of overstay. Overstay a week or two -> prepare the fine and leave by airport immediately. Overstay more than 90 days -> seek legal help immediately and do not put yourself in any situations where you might be detained by police.
If an individual wishes to remain in Thailand for more than 30 days, he/she may wish to obtain a tourist visa at the Royal Thai Embassy or Consulate in the United States, prior to arriving in Thailand. The tourist visa must generally be used within 90 days from the date of issue and allows an initial stay of 60 days.
Visitors with a Single Entry Tourist visa can extend their time in the country by 30 days by visiting a local Thai Immigration Office. An extension of stay will cost 1900 Thai Baht and must be paid in cash (Thai Baht) when applying for the extension.