You do not need a passport to travel within the United States

A passport is not required for domestic travel — flying between US states, driving across state lines, or taking a train within the country. You will need a form of identification, but it does not have to be a passport. A driver's license, state ID card, or even a military ID will work for most domestic travel situations.

The confusion often comes from the fact that you do need a passport to leave the country or enter it from abroad. But if you are staying within US borders, a passport is unnecessary and will not speed up your travel.

Key Takeaways

  • Domestic air travel requires a valid government-issued ID such as a driver's license or state ID card, but not a passport.
  • Road trips and train travel within the US do not require any ID at all, though you may need one to check into a hotel or rent a car.
  • A passport becomes necessary only when crossing into Canada, Mexico, or flying to any destination outside US territory.
  • If you do not have a driver's license or state ID, a passport can serve as acceptable identification for domestic flights.
  • Real ID-compliant identification will be required for domestic flights starting in 2025 if you do not have a passport or other federal ID.

What ID you actually need for domestic flights

The Transportation Security Administration (TSA) accepts several forms of identification at airport security checkpoints for domestic flights. A valid driver's license is the most common choice. A state-issued ID card works just as well. A military ID, passport card, or permanent resident card (green card) will also get you through security.

If you do not have any of these, a passport book can serve as your identification for domestic flights. You do not need anything beyond one of these documents — no passport required, no special paperwork.

Starting in 2025, the TSA will require that your ID be Real ID-compliant. Most modern driver's licenses and state IDs already meet this standard. If yours does not, you can check with your state's DMV or look for a gold star or other marking on your card. A passport or passport card automatically meets Real ID requirements.

Driving and train travel within the US

You do not need any ID to drive a car across state lines or take a train within the country. No identification is checked at state borders, and Amtrak does not require ID for domestic passengers (though you will need it to board if you are using a ticket purchased with a credit card in someone else's name).

You will, however, need a driver's license to legally operate a vehicle. If you are renting a car, the rental company will ask for your driver's license and a credit card. If you are staying in a hotel, they may ask for ID when you check in, though this is not always required.

When you do need a passport for US travel

A passport becomes necessary the moment you cross into another country. This includes travel to Canada, Mexico, the Caribbean, or any other destination outside the United States. You will also need a passport to fly to US territories like Puerto Rico, the US Virgin Islands, or Guam if you are a non-citizen, though US citizens can use a Real ID-compliant driver's license for these destinations.

If you are planning a cruise that leaves from a US port and returns to the same port without stopping in another country, you may be able to use a passport card or a Trusted Traveler card instead of a full passport. Check with your cruise line for their specific requirements.

Passport cards versus passport books for domestic travel

A passport card is a smaller, wallet-sized version of a passport book. For domestic air travel, either one works equally well — TSA does not prefer one over the other. The passport card is cheaper and faster to obtain than a passport book, but it is only valid for land and sea travel to Canada, Mexico, Bermuda, and the Caribbean. You cannot use a passport card for international air travel.

If you are only traveling domestically and do not plan to leave the country by air, a passport card could serve as your backup ID. But if there is any chance you will fly internationally, a passport book is the better choice because it covers all destinations.

What to do if you do not have ID at all

If you do not have a driver's license, state ID, military ID, or passport, you can still fly domestically — but the process is more complicated. The TSA will allow you to board with secondary forms of identification, such as a birth certificate, Social Security card, or school ID, though you will go through additional screening and it may take longer.

The fastest solution is to obtain a state ID card from your local DMV. This is cheaper and faster than a passport and will work for all domestic travel. If you need to travel when ready and cannot get a state ID in time, contact the TSA in advance at 1-866-289-9673 to discuss your options.

Frequently Asked Questions

Can I use my passport card for a domestic flight?

Yes, a passport card is acceptable identification for any domestic flight. It works the same way as a driver's license at TSA security. However, if you plan to travel internationally by air, you will need a full passport book instead.

Do I need a passport to drive to Canada or Mexico?

You do not need a passport to drive to Canada or Mexico, but you do need a valid passport, passport card, or Enhanced Driver's License (EDL) to enter those countries and return to the US. A regular driver's license is not sufficient for land border crossings.

What if I lost my ID and need to fly tomorrow?

Contact the TSA at 1-866-289-9673 before you go to the airport. You can fly with secondary identification like a birth certificate or Social Security card, but you will undergo additional screening. Bring documents that prove your identity and address.

Do children need ID for domestic flights?

Children under 18 do not need ID for domestic flights if they are traveling with an adult. The adult traveling with them must have valid identification. Children traveling alone or with someone other than a parent may need to bring ID.

Is a passport required for flights to Hawaii or Alaska?

No. Hawaii and Alaska are US states, so domestic ID rules explore. A driver's license or state ID is all you need. A passport is only required if you are flying to a destination outside the United States.