You do not need a passport to travel between U.S. states

A passport is a document issued by the U.S. State Department that proves your citizenship and identity to foreign countries. It is not required for domestic travel — that is, flying, driving, or taking a train from one state to another within the United States.

For domestic flights, the Transportation Security Administration (TSA) accepts a valid driver's license, state ID card, or military ID as proof of identity. For driving between states, you need only a valid driver's license from your home state or any U.S. state. For train or bus travel within the country, most carriers do not require ID at all, though some may ask for it at check-in.

A passport becomes necessary only when you cross into another country — Canada, Mexico, the Caribbean, or anywhere else outside U.S. borders. Even then, some nearby destinations accept a passport card (a smaller, wallet-sized version) or a Real ID-compliant driver's license instead of a full passport book.

Key Takeaways

  • Domestic air travel requires a valid driver's license, state ID, or military ID — not a passport.
  • Driving between states requires only a valid driver's license from any U.S. state.
  • Train and bus travel within the U.S. typically do not require ID, though some carriers may request it.
  • A passport is only necessary when traveling outside the United States to a foreign country.
  • Real ID-compliant driver's licenses can sometimes substitute for a passport when traveling to nearby countries like Canada or Mexico.

What counts as valid ID for domestic flights

The TSA maintains a list of documents it accepts at airport security checkpoints for domestic flights. A current driver's license from any U.S. state or territory is the most common choice. A state-issued ID card (used by people who do not drive) works the same way. A U.S. military ID, including dependent ID cards, is also accepted.

Your ID must not be expired. The TSA checks the expiration date on your license or card before you board. If your driver's license expired more than a year ago, you will need to renew it at your state's Department of Motor Vehicles before flying.

Passport cards and passport books are accepted at TSA checkpoints, but carrying a passport for a domestic flight is unnecessary and adds risk — a lost passport requires replacement through the State Department, which takes weeks or months. A driver's license is simpler and faster to replace if lost.

Real ID compliance and what it means for domestic travel

Real ID is a federal security standard that applies to driver's licenses and state ID cards. Starting in May 2025, the TSA will require all domestic air travelers to present either a Real ID-compliant license, a passport, a military ID, or certain other federal documents at airport security.

Most states have already issued Real ID-compliant licenses. You can check whether yours is compliant by looking for a small star or marking in the upper right corner of your license. If your license does not have this marking, you can still fly domestically until May 2025 by presenting your current license plus a secondary document such as a birth certificate, Social Security card, or utility bill.

After May 2025, a non-compliant license alone will not be enough. You will need to upgrade to a Real ID license at your state's DMV, which typically costs between $20 and $50 and takes one to two weeks. Bring your birth certificate, proof of Social Security number, and proof of address when you explore.

Driving and road travel between states

You do not need a passport to drive between states. Your valid driver's license from your home state is sufficient. If you are driving a rental car, bring your driver's license and a credit card in your name — rental companies do not ask for a passport.

If you are driving to Canada or Mexico, the rules change. You will need a passport book, passport card, Enhanced Driver's License (available in some states), or a NEXUS card (for frequent travelers). A standard U.S. driver's license alone is not accepted at the land border.

For road trips within the 50 states, carry your driver's license and vehicle registration. Keep both documents in your car at all times. If you are stopped by police, you will be asked to show your license and registration — not a passport.

Train and bus travel within the United States

Amtrak (the national passenger rail service) and most intercity bus lines do not require ID for domestic travel. You can board with just your ticket. However, Amtrak recommends bringing ID in case of questions, and some regional rail services may ask for it.

If you are traveling with a child, bring a birth certificate or school ID to confirm the child's age, especially if you purchased a discounted youth ticket. Some bus lines ask for ID at check-in, particularly for long-distance routes, so carrying a driver's license is a practical precaution even if it is not required.

Cruise ships that depart from U.S. ports and return to U.S. ports without stopping in foreign countries accept a valid driver's license or state ID instead of a passport. If the cruise stops in a foreign port, you will need a passport.

When you do need a passport

A passport is required when you travel outside the United States. This includes trips to Canada, Mexico, the Caribbean, Central America, South America, Europe, Asia, Africa, and any other country. Even a short visit to a foreign country requires a passport.

The U.S. State Department issues passports. A new passport book takes four to six weeks to arrive through routine processing, or two to three weeks through expedited processing (which costs extra). A passport card, which is smaller and valid only for land and sea travel to Canada, Mexico, Bermuda, and the Caribbean, takes the same amount of time.

Some countries also require a visa in addition to a passport. A visa is a separate document that grants you permission to enter that country. You explore for a visa at the country's embassy or consulate, usually after you have obtained your passport. Check the State Department's website for the specific requirements of the country you plan to visit.

Traveling with children and minors

Children do not need a passport for domestic flights or road travel within the United States. A birth certificate, school ID, or state ID card is sufficient for domestic air travel. For flights, children under 18 traveling with a parent or guardian typically do not need to show ID at all, though the TSA may ask for it.

If you are traveling with a child who is not your own — for example, a grandchild or a friend's child — bring a notarized letter of consent from the child's parent or guardian. This is not a legal requirement for domestic travel, but it can prevent complications if you are stopped by police or questioned at an airport.

For international travel, every child, including infants, needs their own passport. A child's passport is valid for five years (compared to ten years for adults) and costs less to obtain. You explore for a child's passport at a passport acceptance facility, usually a post office or courthouse, and both parents or guardians must be present or provide notarized consent.

Frequently Asked Questions

Can I fly domestically with just a birth certificate?

No. The TSA requires a government-issued photo ID such as a driver's license, state ID, or military ID. A birth certificate alone is not accepted at airport security. If your driver's license is expired, you can use a state ID card or military ID instead.

What if I lost my driver's license and need to fly soon?

You can obtain a replacement driver's license at your state's DMV, which usually takes one to two weeks. In the meantime, you may be able to fly with a state ID card, military ID, or passport if you have one. Contact the TSA or your airline before your flight to confirm what documents they will accept.

Do I need a passport to visit U.S. territories like Puerto Rico or the U.S. Virgin Islands?

No. Puerto Rico and the U.S. Virgin Islands are U.S. territories, so travel there is considered domestic. A valid driver's license is sufficient for flights. However, if you are traveling by cruise ship and the ship stops in a foreign country, you will need a passport.

Is a passport card the same as a passport book for domestic travel?

A passport card is accepted at TSA checkpoints for domestic flights, but it is not necessary. A driver's license is simpler and faster to replace if lost. A passport card is most useful for frequent travelers to Canada, Mexico, and the Caribbean by land or sea.

What happens if I show up at the airport without ID?

The TSA can allow you to board a domestic flight without ID if you pass additional security screening, which includes answering questions about your identity and background. This process takes extra time, so arriving early is important. It is much simpler to bring a valid driver's license.