You do not need a passport to travel within the United States
A passport is not required for domestic travel — flying between U.S. states, taking a train across the country, or driving to another state. You can travel anywhere within U.S. borders using a state-issued ID, a Real ID-compliant driver's license, or a passport card. The only document you absolutely need is a valid form of identification that proves who you are.
The confusion often comes from international travel rules. A passport is required only when you leave the country — whether by plane, ship, or land border crossing to Canada or Mexico. Within the 50 states and U.S. territories, domestic ID is sufficient.
Key Takeaways
- A state driver's license or ID card is the standard document for domestic air and train travel within the United States.
- A passport is required only for international travel outside U.S. borders, not for travel between states.
- Real ID-compliant driver's licenses meet federal requirements for domestic flights and will be required for all domestic air travel starting May 7, 2025.
- U.S. territories like Puerto Rico, the U.S. Virgin Islands, and Guam count as domestic travel and do not require a passport.
- A passport card is a valid form of ID for domestic travel but is primarily designed for land and sea border crossings to Canada and Mexico.
What ID you need for domestic flights
For domestic flights, the Transportation Security Administration (TSA) accepts a standard state driver's license or state ID card. You do not need a passport. The TSA also accepts military IDs, tribal IDs, and other government-issued documents that show your name and photo.
Starting May 7, 2025, all driver's licenses and ID cards used for domestic flights must be Real ID-compliant. A Real ID is a driver's license or state ID that meets federal security standards set by the Department of Homeland Security. Most states have already issued Real ID licenses, but some people still carry older, non-compliant versions. You can check your license — a Real ID has a gold or black star in the upper right corner. If your license does not have this star, you can still fly domestically until May 7, 2025, but after that date you will need either a Real ID license, a passport, or a passport card.
What ID you need for trains and buses
Amtrak and intercity bus services like Greyhound accept a standard state driver's license or ID card. You do not need a passport. Some regional train services do not require ID at all for domestic travel, though it is always wise to carry one.
If you are traveling by train or bus to Canada or Mexico, a passport or passport card is required. A Real ID license alone is not sufficient for land border crossings.
Travel to U.S. territories without a passport
U.S. territories — including Puerto Rico, the U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands — are considered domestic destinations. You can travel to these places with a state driver's license or ID card, just as you would travel to another state. No passport is required.
However, if you are a U.S. citizen born in one of these territories, you may want to carry a passport or birth certificate for re-entry to the mainland, as some airlines ask for proof of citizenship. A standard driver's license is usually accepted, but carrying additional documentation prevents delays.
When you do need a passport
A passport is required when you travel outside the United States. This includes travel to Canada, Mexico, the Caribbean, Central America, South America, Europe, Asia, Africa, Australia, and any other country. You also need a passport for cruises that leave from a U.S. port and stop at foreign ports, even if the cruise returns to the same U.S. port.
Some cruises that visit only U.S. ports (called "closed-loop cruises") allow you to travel with a state ID or passport card instead of a full passport. Check with your cruise line before booking.
Passport cards and passport books: the difference
A passport book is the traditional passport — a booklet that is valid for international travel by air, sea, or land. A passport card is a wallet-sized card that is valid for international travel by land or sea only, not by air. Both are issued by the U.S. Department of State and both prove U.S. citizenship.
For domestic travel within the United States, you do not need either one. A passport card is useful if you frequently cross the land border to Canada or Mexico by car or on foot, but for domestic flights and train travel, a state driver's license is simpler and faster to show at security.
Real ID compliance and what changes in 2025
The Real ID Act, passed by Congress in 2005, set federal security standards for state driver's licenses and ID cards. Starting May 7, 2025, the TSA will not accept non-compliant licenses for domestic flights. You will need one of these instead: a Real ID-compliant driver's license or ID card, a passport, a passport card, a military ID, a tribal ID, or a NEXUS card.
If your state driver's license does not have a star, you can renew it at your state's Department of Motor Vehicles and request a Real ID version. The process usually takes a few weeks. Bring proof of identity, proof of Social Security number, and proof of residency. Some states charge a small fee for a Real ID license; others do not. Check your state's DMV website for the exact requirements and cost.
Frequently Asked Questions
Can I fly domestically with just my passport card?
Yes. A passport card is a valid form of ID for domestic flights. However, it is not required — a state driver's license works just as well and is faster to show at security.
Do I need a passport to drive to another state?
No. You do not need any federal ID to drive between U.S. states. A state driver's license is standard, but technically you only need it if you are stopped by police. For driving to Canada or Mexico, you need a passport, passport card, or Enhanced Driver's License.
What if my driver's license is expired?
The TSA will not accept an expired driver's license for domestic flights. You will need a valid ID. Renew your license at your state's DMV before you travel. If you need to fly before you can renew, a passport or passport card will work.
Do children need ID for domestic flights?
Children under 18 do not need to show ID for domestic flights if they are traveling with an adult. The adult must have valid ID. Children traveling alone or with someone other than a parent or guardian should carry ID.
Can I use my passport to rent a car domestically?
Yes. A passport is a valid form of ID for renting a car. Most rental companies prefer a driver's license, but they will accept a passport if you do not have one.