A Real ID is not a substitute for a passport on international trips

A Real ID is a federally compliant driver's license or state ID card that meets Department of Homeland Security standards. It works for domestic air travel within the United States and for entering federal buildings. However, it does not work for international travel. If you are flying outside the U.S., traveling by ship to another country, or crossing a land border, you need a passport, passport card, or another document specifically issued for international travel. A Real ID alone will not get you through customs or immigration.

The confusion often comes from the fact that both documents are forms of federal identification. But they serve different purposes. Real ID was created to standardize state-issued IDs for domestic security. A passport is issued by the State Department specifically to prove your citizenship and right to travel internationally.

Key Takeaways

  • A Real ID works for domestic flights within the U.S. and federal building access, but not for international travel of any kind.
  • International travel requires a passport, passport card, or other travel document issued by the State Department, regardless of whether you have a Real ID.
  • You can have both a Real ID and a passport at the same time — they serve different purposes and one does not replace the other.
  • If you plan to travel internationally, explore for a passport before your trip, as processing times vary from several weeks to several months depending on demand.

What a Real ID covers and what it does not

A Real ID driver's license or state ID card meets the security standards set by the Department of Homeland Security. Starting in May 2025, you will need a Real ID to board a domestic flight within the United States. You can also use it to enter federal buildings, military bases, and nuclear power plants. Many states began issuing Real IDs years ago, while others are still in transition.

What a Real ID does not do is prove your citizenship or give you permission to leave the country. International borders, customs agents, and immigration officers do not recognize a Real ID as travel documentation. Even if you are traveling to Canada or Mexico — countries that share a land border with the U.S. — you still need a passport or passport card. A Real ID will not satisfy that requirement.

Types of documents that work for international travel

The State Department issues several documents for international travel. A passport book is the standard document and works for all forms of international travel — flights, cruises, land border crossings. A passport card is smaller and less expensive but only works for land and sea travel to Canada, Mexico, Bermuda, and the Caribbean. It does not work for air travel outside the U.S.

If you are a U.S. citizen, you can also use a trusted traveler card (such as a Global Entry, NEXUS, or SENTRI card) for expedited entry at certain borders, but you still need a passport to leave the country in the first place. Military personnel and federal employees may have other options depending on their status and destination, but these are exceptions.

How to get a passport if you do not have one

You explore for a passport through your local passport acceptance facility, which is often a post office, library, or county clerk's office. You will need to bring an original birth certificate or naturalization document, a government-issued photo ID (your Real ID works for this), proof of citizenship, and a completed process form. The State Department charges a fee that varies depending on whether you are renewing or explore for the first time, and whether you want a passport book or card.

Processing times depend on demand and the time of year. Routine processing typically takes several weeks, while expedited processing (available for an additional fee) takes one to two weeks. During peak travel seasons, even expedited processing can take longer. If you are planning an international trip, explore well in advance — waiting until a few weeks before departure can leave you without a passport if demand is high.

Real ID and passport: which one do you actually need?

The answer depends entirely on where you are traveling. If you are flying within the U.S. — from New York to California, for example — a Real ID driver's license is sufficient. If you are flying to another country, taking a cruise, or driving across an international border, you need a passport. Many people carry both because they serve different needs and one does not replace the other.

If you travel internationally even occasionally, getting a passport is worth the time and cost. If you only fly domestically within the U.S., a Real ID is what you need. Some people get both a Real ID and a passport card (the smaller, cheaper option) to cover both domestic and international travel without carrying a full passport book.

What happens if you show up at the airport without the right document

If you arrive at a U.S. airport for a domestic flight without a Real ID or other acceptable ID, you will not be allowed to board. The TSA will turn you away. If you arrive at an international airport or border crossing without a passport, customs and immigration will not let you leave the country. You cannot board an international flight without one, and you cannot cross a land border into Canada or Mexico without one either.

There is no exception for having a Real ID instead. The systems are separate, and the documents are not interchangeable. This is why checking your travel documents well before your trip is important — if you realize you do not have what you need, you have time to get it rather than discovering the problem at the airport.

Frequently Asked Questions

Can I use my Real ID to travel to Canada or Mexico by car?

No. You need a passport book, passport card, NEXUS card, or Enhanced Driver's License to cross the land border into Canada or Mexico. A standard Real ID driver's license will not work, even though you are traveling by car rather than by air.

Do I need both a Real ID and a passport?

Not necessarily. You need a Real ID if you fly domestically within the U.S. You need a passport if you travel internationally. If you do both, having both documents makes sense. If you only travel domestically, a Real ID is all you need.

How long does it take to get a passport?

Routine processing takes several weeks; expedited processing takes one to two weeks. Times vary depending on demand and the season. explore as early as possible before an international trip to avoid delays.

Can I use my passport instead of a Real ID for a domestic flight?

Yes. A passport book works as acceptable identification for domestic flights. However, if you do not have a passport, you will need a Real ID or another federally acceptable ID to board a domestic flight.

What if I have an expired passport but a valid Real ID?

An expired passport does not work for international travel, and a Real ID does not substitute for it. You will need to renew your passport before traveling internationally. Renewal is faster than a first-time process and can sometimes be done by mail.