Whether you need a visa depends on your citizenship and how long you plan to stay

The answer depends on three things: what country issued your passport, whether you're entering for tourism or work, and how long you'll be there. Citizens of about 40 countries can enter the U.S. without a visa for short trips under a program called the Visa Waiver Program. Everyone else needs a visa before boarding a plane or ship to the U.S. Even if you don't need a visa, you'll still go through immigration screening when you arrive.

If your passport is from a country not on the Visa Waiver Program list, you must obtain a visa at a U.S. embassy or consulate in your home country before you travel. This process takes weeks or months, not days. If you're a citizen of a Visa Waiver Program country, you can enter without a visa but must register online through the Electronic System for Travel Authorization (ESTA) before your trip.

Key Takeaways

  • Citizens of about 40 countries can enter the U.S. for tourism or business without a visa if they register for ESTA online first.
  • Citizens of all other countries must obtain a visa from a U.S. embassy or consulate before traveling, a process that typically takes several weeks.
  • A visa is required for any stay longer than 90 days, regardless of your country of citizenship.
  • Work, study, and residence visas are separate from tourist visas and require sponsorship from a U.S. employer, school, or family member.

The Visa Waiver Program and ESTA registration

If your passport is from one of these countries, you can enter the U.S. for tourism, business meetings, or short visits without a visa: Andorra, Australia, Austria, Belgium, Brunei, Chile, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Japan, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Monaco, Netherlands, New Zealand, Norway, Poland, Portugal, San Marino, Singapore, Slovakia, Slovenia, South Korea, Spain, Sweden, Switzerland, Taiwan, and the United Kingdom.

Before boarding your flight, you must complete the ESTA form online at esta.cbp.dhs.gov. This is a short questionnaire about your health, criminal history, and reason for travel. The form costs $14 and takes about 10 minutes. Most people receive approval within minutes, though some cases take up to 72 hours. ESTA approval lasts for two years or until your passport expires, whichever comes first. You do not need to renew it for each trip during that time.

ESTA allows you to stay in the U.S. for up to 90 days per visit. You cannot work, study, or live in the U.S. on ESTA. If you plan to do any of those things, you need a different type of visa, even if you're from a Visa Waiver Program country.

Getting a visa if your country is not on the Visa Waiver Program list

If your passport is from a country not listed above, you must obtain a visa before you travel. Start by visiting the website of the U.S. embassy or consulate in your home country. Each embassy has its own process process and wait times, which vary widely depending on the country and the type of visa you need.

The general process is: complete the online visa form (called the DS-160), pay the visa fee (usually between $140 and $190 for a tourist visa, though this varies by country), schedule an interview at the embassy or consulate, and attend the interview in person. Bring your passport, the confirmation page from your online form, a photo, and proof of your ties to your home country—such as a job letter, property deed, or family documents. The consulate wants to see that you plan to return home after your visit.

Processing times range from a few days to several months, depending on the country and current demand. Some countries have wait times of six months or longer. Plan ahead and do not book your flight until you have the visa in hand.

Work, study, and residence visas

If you plan to work in the U.S., you need a work visa, not a tourist visa. The most common work visas are the H-1B (for specialty occupations), L-1 (for transfers within a company), and O-1 (for people with extraordinary ability in their field). Your U.S. employer must sponsor you and file paperwork with U.S. immigration before you can explore for the visa.

If you want to study in the U.S., you need an F-1 visa (for academic study) or M-1 visa (for vocational training). Your school must issue you a document called an I-20 before you can explore. You'll then explore for the visa at a U.S. embassy or consulate.

If you want to live permanently in the U.S., you need an immigrant visa or a green card. This requires sponsorship from a family member or employer and is a separate, longer process. when ready relatives of U.S. citizens (spouse, parent, or child under 21) can move through this process faster than other family relationships or employment-based sponsorship.

What happens at the border if you don't have the right visa

If you arrive at a U.S. airport or land border without the required visa or ESTA, you will be denied entry and sent back to your home country on the next available flight. You will also be flagged in the system, which can make future visa applications harder. Border officers have the authority to refuse entry even if you have a valid visa if they believe you don't meet the requirements.

If you're unsure whether you need a visa, check the U.S. State Department website at travel.state.gov. You can search by your country of citizenship and the purpose of your trip. If you still have questions, contact the U.S. embassy or consulate in your country before you book your flight.

Visa extensions and changing your status

If you're in the U.S. on ESTA or a tourist visa and want to stay longer, you can request an extension before your time runs out. Extensions are not may provide, and you must show a valid reason—such as a family emergency or unexpected medical treatment. You cannot extend a visa to change your purpose; for example, you cannot extend a tourist visa to work.

If you want to change your status—such as from tourist to student or from student to worker—you must do so while you're still in the U.S. and before your current visa expires. Your new sponsor (school or employer) must file the paperwork with U.S. immigration. This process is complex and usually requires a lawyer. Do not wait until your current visa is about to expire to start this process.

Frequently Asked Questions

Can I enter the U.S. without a passport?

No. You must have a valid passport from your country of citizenship. Some countries allow their citizens to enter with a national ID card instead of a passport, but the U.S. does not. Your passport must be valid for at least six months beyond your planned departure date from the U.S., though some countries have different rules.

What if my ESTA is denied?

If your ESTA is denied, you must obtain a visa instead. You cannot reapply for ESTA. Contact the U.S. embassy or consulate in your country to begin the visa process. Denial reasons include criminal history, overstaying a previous visa, or security concerns. You can request more information about why you were denied.

Do children need their own visa or ESTA?

Yes. Every person, including infants and children, needs either a visa or ESTA to enter the U.S., even if they're traveling with a parent. Children from Visa Waiver Program countries must register for ESTA just like adults. Children from other countries need their own visa.

Can I work in the U.S. on a tourist visa?

No. Working on a tourist visa or ESTA is illegal and can result in deportation and a ban from entering the U.S. in the future. If you want to work in the U.S., your employer must sponsor you for a work visa before you travel.

How long does a visa last once I have it?

A visa stamp in your passport is valid for a set period—usually six months to 10 years, depending on the type and your country of citizenship. However, the visa validity period is not the same as how long you can stay. The length of your stay is determined by the immigration officer when you arrive. Always check the stamp in your passport to see both dates.