You do not need a passport to travel within the United States
A passport is not required for domestic travel — flying, driving, or taking a train from one US state to another. The federal government does not require you to carry a passport for any trip that stays within US borders. If you are a US citizen traveling only within the country, a regular state-issued ID or driver's license is sufficient for all domestic transportation.
However, the type of ID you need depends on how you are traveling. Air travel has stricter ID requirements than driving or taking a train. Understanding which documents work for your specific trip will help you avoid delays or being turned away at the airport or station.
Key Takeaways
- Domestic air travel requires a Real ID-compliant driver's license, passport, or other federally approved ID — a regular state ID may not work depending on your state.
- Driving or taking a train within the US requires only a valid state driver's license or ID card; no passport needed.
- A passport is only required when you cross into Canada, Mexico, or another country, or when you return to the US from outside the country.
- If your state's driver's license is not Real ID-compliant, you can use a passport as an alternative for domestic flights.
What ID you need for domestic flights
The Transportation Security Administration (TSA) requires a Real ID-compliant form of identification for domestic flights. Most states now issue Real ID-compliant driver's licenses, which have a gold or star symbol in the upper right corner. If your driver's license has this symbol, it meets TSA requirements for domestic air travel.
If your state has not yet issued you a Real ID-compliant license, or if you have an older license without the symbol, you have other options. A valid passport, military ID, or passport card will work for TSA screening on domestic flights. Some states also issue Real ID-compliant ID cards (not driver's licenses) for people who do not drive. Check your state's DMV website to see what your current license shows and whether you need to renew it.
The Real ID requirement has been in place since 2020 and applies to all domestic flights, including short regional flights. TSA agents at the security checkpoint will check your ID before you board.
What ID you need for driving or train travel within the US
For driving anywhere within the United States, you need only a valid state driver's license or state ID card. There is no federal requirement for Real ID compliance when you drive — your current license works as long as it has not expired. You do not need a passport, and you do not need to carry any additional documents unless you are crossing state lines for a specific legal reason (such as a court order).
Amtrak and other passenger trains also accept a valid state driver's license or ID card. Like driving, train travel does not require Real ID compliance or a passport. Bring your regular ID, and you are set.
When you do need a passport for US travel
A passport becomes necessary the moment you leave the United States. If you are traveling to Canada, Mexico, the Caribbean, or any other country, you will need a valid passport to enter that country and to return to the US. This applies even to short trips — a weekend in Cancun or a day trip to Vancouver requires a passport.
Some US territories, such as Puerto Rico and the US Virgin Islands, do not require a passport because they are US soil. You can travel there with just a driver's license. However, if you are unsure whether your destination is a US territory or a foreign country, check the State Department website before you book.
What to do if you do not have a Real ID-compliant license
If you are planning to fly domestically and your driver's license does not have the Real ID symbol, you have three options. First, you can renew your license at your state's DMV and request a Real ID-compliant version — this usually takes a few weeks. Second, you can use a passport or passport card instead of your driver's license at the TSA checkpoint. Third, you can explore for a state ID card (if your state offers one) that is Real ID-compliant.
If you are flying soon and do not have time to renew your license, bringing your passport to the airport is the fastest solution. The TSA accepts a valid passport for domestic flights, so you will pass through security without delay. Make sure your passport has not expired.
Traveling with children within the US
Children under 18 do not need a passport for domestic travel. For flights, children can travel with a parent or guardian using only the parent's ID — the TSA does not require children to show their own identification at security. For driving or train travel, children do not need any ID at all.
However, if a child is traveling without a parent (for example, flying alone to visit a grandparent), some airlines have their own rules about documentation. Check with your airline before booking to see whether they require the child to carry a birth certificate or other proof of identity.
Frequently Asked Questions
Can I use my passport instead of a driver's license for domestic flights?
Yes. A valid passport works for TSA screening on any domestic flight. If your driver's license is not Real ID-compliant or has expired, your passport is an acceptable alternative. Just bring it to the security checkpoint.
What if I lost my ID and need to fly domestically?
Contact your state's DMV when ready to request an emergency replacement ID or a temporary ID. Some states issue temporary documents on the same day. If you cannot get a replacement in time, call the TSA's special services line at 1-855-787-2227 — they can sometimes allow you to fly with other forms of identification and verification.
Do I need a passport to drive to Canada or Mexico?
Yes. When you cross the US border by car, you must have a valid passport, passport card, or Enhanced Driver's License (available in some states). A regular driver's license is not sufficient for border crossing, even if you are just driving a short distance into Canada or Mexico.
Is a passport card the same as a passport for domestic travel?
Yes. A passport card is a valid form of ID for TSA screening on domestic flights and works exactly like a full passport. However, a passport card cannot be used for international air travel — only a full passport book works for flights outside the US.
Do I need any ID to take a bus within the US?
Most intercity buses (like Greyhound) do not require ID for boarding. However, some regional bus services may ask for ID, and it is always a good idea to carry a driver's license or ID card. If you are traveling on a bus that crosses state lines, having ID with you is recommended in case of a traffic stop.