Embassy
Embassy of the United States, Bangkok
Bangkok
American citizens do not need a visa for Thailand. Show your passport at the border and stay up to 30 days.

USA
United States
THA
Thailand
No visa needed
Tourists with eligible passports can visit without applying for a visa.
Check your passport is valid for the whole stay, ideally six months beyond it.
Carry proof of onward travel and of funds; border officers can ask for both.
Note the maximum stay and count your days in Thailand.
Your passport and trip length decide which tourist route fits.
How to apply
Documents required
How to apply
Documents required
How to apply
Documents required
How to apply
Documents required
For lost passports and emergencies.
Embassy
Bangkok
Consulate general
Chiang Mai
387 Witchayanond Road Chiang Mai 50300, Thailand
Day-by-day itineraries by snuck, shaped around you.
Best time to go: November to February is usually cooler and drier, but flights and rooms can be harder to find around major holidays. Ko Samui and the Central Gulf Coast have a different pattern, with the dry peak season from May to October.

Thailand is a Southeast Asian kingdom on the Indochinese and Malay peninsulas, facing two seas.
Going to Thailand
Places close to Thailand with simpler entry for you.
Visa waiver program rules: One can enter for 30 days per visa exempt stay. One can enter an unlimited number of times via air.
American citizens do not need a visa for Thailand. Show your passport at the border and stay up to 30 days.
Up to 30 days each visit with the no visa needed rule. Staying longer can mean a fine or a ban from coming back.
Thai citizens need a visa for the United States, from its embassy or consulate.
Argentina, Brazil, Canada, Chile Colombia, and 5 more can enter without applying before they travel.
Brunei, Malaysia, Philippines, Singapore Cambodia, and 3 more let american citizens in without applying before travel.
Check your passport is valid for the whole stay, ideally six months beyond it. Carry proof of onward travel and of funds; border officers can ask for both.
Thai baht (฿). Carry some cash for arrival, especially if a visa fee is paid at the border.
Thai.
It ranks #12 and reaches 150 destinations without applying ahead.
Reviewed by @snuck