You do not need a passport to travel domestically within the United States
A passport is a document issued by the federal government that proves your citizenship and identity to other countries. For travel within the US — flying between states, driving across borders, or taking a train — you do not need one. A passport is only required when you leave the country or enter a US territory that has its own entry rules, like Puerto Rico or the US Virgin Islands.
For domestic flights and some other domestic travel, you will need a different form of identification instead. The rules depend on how you are traveling and which states are involved.
Key Takeaways
- Domestic air travel requires a Real ID-compliant driver's license, passport card, or other federal ID — not a full passport.
- Driving between US states requires only a valid driver's license from any state; no passport or passport card is needed.
- Train and bus travel within the US do not require any federal ID, though some carriers may ask for identification.
- Puerto Rico, the US Virgin Islands, and Guam are US territories where entry rules vary; some require a passport even though they are US soil.
What you need for domestic flights
If you are flying between US states, the Transportation Security Administration (TSA) requires you to show a valid ID at the airport. A full passport works, but you do not need one. A Real ID-compliant driver's license — one marked with a star or other indicator showing it meets federal standards — is the most common choice and is accepted at every US airport.
Other documents that work for domestic flights include a passport card (a smaller, wallet-sized version of a passport), a military ID, a tribal ID, or a state ID card. You do not need a full passport book. If your driver's license is not Real ID-compliant, you can still fly domestically using a passport card, military ID, or other approved document instead.
Real ID requirements took effect in 2020, though enforcement has been phased in over time. If you have an older driver's license that does not meet Real ID standards, check your state's DMV website to see whether you can renew it to get the compliant version.
What you need for driving between states
Driving across state lines requires only a valid driver's license from your home state. You do not need a passport, passport card, or any federal ID. Your state-issued driver's license is sufficient proof of identity and driving privileges in every other US state.
If you are driving to Canada or Mexico, the rules change — you will need either a passport, passport card, or an Enhanced Driver's License (EDL) depending on how you cross the border. But for travel that stays within the US, your regular driver's license is all you need.
What you need for trains and buses
Amtrak (the national passenger rail service) and most intercity bus lines do not require a federal ID for domestic travel. You can board without showing a passport or Real ID-compliant license. Some carriers may ask for identification to verify your ticket, but this is usually just to confirm you are the person who purchased it — a regular driver's license, state ID, or even a photo ID from a school or employer may work.
If you are traveling with a child, bring a birth certificate or other proof of age, as some carriers ask for it. For Amtrak specifically, you do not need to show ID unless you are using a ticket purchased under someone else's name.
US territories and when you do need a passport
Puerto Rico, the US Virgin Islands, and Guam are US territories, which means they are part of the United States. However, entry rules for these places are different from flying to another state. For Puerto Rico and the US Virgin Islands, you do not need a passport if you are a US citizen — a Real ID-compliant driver's license or passport card works. For Guam, a passport is required even for US citizens.
If you are not a US citizen, you will need a passport to enter any US territory. The rules can change, so check the specific territory's government website before you book your trip.
What counts as a valid ID for domestic travel
| Type of Travel | What Works | What Does Not Work |
|---|---|---|
| Domestic flights | Real ID driver's license, passport card, military ID, tribal ID, state ID card | Expired ID, passport book (though it works, you do not need it) |
| Driving between states | Valid driver's license from any state | Expired license, international driving permit alone |
| Trains and buses | Usually not required; any photo ID if asked | None — no ID is typically required |
| Puerto Rico or US Virgin Islands | Real ID driver's license, passport card, passport book | Expired ID, non-compliant driver's license |
Common mistakes to avoid
The biggest mistake is assuming you need a passport for any domestic travel. You do not. Many people renew their passports unnecessarily before a domestic flight, which costs money and takes time. If you are staying within the US, a Real ID-compliant driver's license is faster and cheaper.
Another common error is traveling with an expired ID. Even if your passport is expired, it will not work for domestic flights — TSA requires a valid, unexpired ID. If your driver's license is expired, renew it before you fly. For driving between states, an expired license is also not acceptable.
Do not confuse a passport card with a full passport book. They are different documents. A passport card is smaller and cheaper, and it works for domestic flights and some US territory travel. A full passport book is larger and is required for international travel outside the Americas. If you only need ID for domestic flights, a passport card is a better choice than a full passport.
Frequently Asked Questions
Can I fly domestically with an expired passport?
No. TSA requires a valid, unexpired ID for all domestic flights. An expired passport does not work, even if it is a passport book. If your passport is expired and you do not have another valid ID, you will need to renew your driver's license or get a passport card before you can fly.
Do I need a passport to visit Puerto Rico?
Not if you are a US citizen. A Real ID-compliant driver's license or passport card works for entry. If you are not a US citizen, you will need a passport. Check the Puerto Rico government website before you travel, as entry rules can change.
What if I lost my driver's license and only have a passport?
A passport works for domestic flights, so you can fly. However, for driving between states, you will need a valid driver's license. Contact your state's DMV to replace your lost license before you drive.
Can I use my passport card instead of a Real ID driver's license?
Yes. A passport card is accepted for domestic flights and counts as a valid federal ID. If your driver's license is not Real ID-compliant, a passport card is a good alternative for air travel.
Do children need a passport for domestic flights?
No. Children do not need a passport for domestic flights. TSA does not require ID for children under 18 on domestic flights, though some airlines may ask for a birth certificate or other proof of age. Check your airline's policy before you travel.