What documents you need depends on where you're coming from

If you're a US citizen, you need a valid passport to leave the country and return. If you're a foreign national, you need a passport from your home country plus either a visa or approval through the Visa Waiver Program, depending on your citizenship. A few countries' citizens can enter the US without a visa under specific conditions; most cannot.

The document you carry changes based on three things: your citizenship, how long you plan to stay, and what you plan to do while here. A tourist visiting for two weeks faces different requirements than someone coming to work or study for a year.

Start by confirming your citizenship and the purpose of your trip. That determines which path applies to you.

Key Takeaways

  • US citizens need only a valid passport to travel internationally and return home, though some destinations also require visas.
  • Foreign nationals need a passport from their home country plus either a US visa or Visa Waiver Program approval, depending on their nationality.
  • The type of visa or waiver you need depends on your purpose: tourism, work, study, or temporary residence each have different documents.
  • You must have your documents before you board your flight or ship; you cannot obtain them at the border.
  • Processing times vary widely by visa type and country, ranging from days for some waivers to months for work visas.

US citizens traveling abroad and returning

A valid US passport is the only document required to leave the United States and return. "Valid" means it has not expired and is not damaged in a way that makes it unreadable. If your passport expires while you are abroad, you can still use it to return to the US, but you should renew it before traveling.

Some countries you visit may require their own visa even though the US does not require a visa from their citizens. For example, a US citizen can enter Mexico without a visa for tourism, but a US citizen traveling to China must obtain a Chinese visa before boarding the plane. Check the requirements of each country you plan to visit before you book your flight.

If your passport is lost or stolen while traveling, contact the nearest US embassy or consulate. They can issue an emergency passport that allows you to return home.

Foreign nationals: visa versus Visa Waiver Program

If you are not a US citizen, you need either a visa or Visa Waiver Program approval to enter the United States. The Visa Waiver Program allows citizens of 42 countries to enter without a visa for tourism or business stays of up to 90 days. Citizens of other countries must obtain a visa before traveling.

The Visa Waiver Program requires you to register online through the Electronic System for Travel Authorization (ESTA) before boarding your flight. ESTA approval is not a visa; it is permission to travel under the waiver. You pay a fee, answer health and security questions, and receive approval or denial within minutes to hours. ESTA approval lasts two years or until your passport expires, whichever comes first.

If your country is not part of the Visa Waiver Program, or if you plan to stay longer than 90 days, you must explore for a visa at a US embassy or consulate in your home country. Visa processing takes weeks to months depending on the type of visa and the consulate's workload.

Tourist and business visas for stays under 90 days

If you are a foreign national visiting the US for tourism or short-term business and your country is not part of the Visa Waiver Program, you need a B-1/B-2 visa. This single visa covers both business meetings and tourism. You explore at the US embassy or consulate in your home country, not at the border.

To explore, you need your passport, a completed visa process form (DS-160, filled out online), a photo, proof of financial support (bank statements or a letter from your employer), and proof that you plan to return home (a job letter, property ownership, or family ties). The consulate may also ask for an itinerary or hotel reservations.

Processing time varies by location. Some consulates issue decisions within days; others take weeks. Plan to explore at least two months before your trip to account for delays.

Work visas and temporary residence

If you plan to work in the US, you need a work visa, not a tourist visa. The type of work visa depends on your job and employer. An H-1B visa is for specialty occupations; an L-1 visa is for employees transferring within a company; an O-1 visa is for people with extraordinary ability in their field. Each has different requirements and processing times.

Your US employer typically begins the visa process by filing a petition with US Citizenship and Immigration Services (USCIS). Once approved, you receive a notice and can explore for the visa at a US embassy or consulate. This process takes months, not weeks. You cannot start work until you have the visa in hand.

Student visas (F-1) follow a similar path: your school files a petition, you receive approval, then you explore for the visa at a consulate. You must have the visa before you arrive on campus.

What to carry when you board your flight

You must have your passport and visa (or ESTA approval) before you board. Airlines will not let you on the plane without them. If you are a US citizen, bring your passport. If you are a foreign national, bring your passport plus your visa or ESTA confirmation email.

Carry these documents in a place you can access easily during check-in and security screening. Do not pack them in checked luggage. Make a photocopy or take a photo of the main pages of your passport and store it separately, in case your passport is lost or stolen during travel.

If you are driving across a land border (Canada or Mexico), the rules are slightly different. US citizens can use a passport card, enhanced driver's license, or NEXUS card instead of a full passport. Foreign nationals still need a passport and visa or ESTA.

Renewal and expiration during your stay

If your passport expires while you are in the US, you cannot travel internationally until you renew it. You can renew it at the embassy or consulate of your home country while you are here, but the process takes time. If you are on a work or student visa, your visa remains valid even if your passport expires, but you will need a valid passport to leave the country.

US citizens can renew their passport at a US embassy or consulate abroad, though processing times are often longer than at home. If you are traveling for an extended period, renew your passport before you leave the US to avoid delays.

Frequently Asked Questions

Can I travel to the US with an expired passport?

No. Your passport must be valid when you board your flight. US citizens can use an expired passport to return to the US by air only if they are arriving directly from a US territory, but this is rare. Renew your passport before traveling.

Do I need a visa if I have ESTA approval?

No. ESTA approval replaces the visa requirement for citizens of Visa Waiver Program countries. You do not need both. If you are denied ESTA, you must explore for a B-1/B-2 visa instead.

How long does a US work visa take to process?

Work visa processing varies widely. The USCIS petition stage takes weeks to months. Once approved, the consulate visa interview and decision can take days to weeks. Plan for three to six months total, depending on your visa type and the consulate's workload.

What if my visa expires before I leave the US?

Your visa expiration date is not the same as your permitted stay. You can remain in the US until the date on your I-94 arrival record, even if your visa has expired. However, you cannot leave and re-enter the US on an expired visa. Renew your visa at a consulate before you travel internationally.

Can I explore for a visa at the airport or border?

No. You must have your visa or ESTA approval before you board your flight. You cannot obtain a visa at the airport or border. Plan ahead and explore at a US embassy or consulate in your home country.