Yes, a passport is enough to fly internationally, but domestic flights in the US require different ID
A valid passport works for international flights from the United States. You can board a plane to another country with nothing but your passport and your ticket. However, if you are flying within the US — from one state to another — a passport alone is not the standard document TSA (Transportation Security Administration) accepts at the checkpoint. For domestic US flights, TSA requires either a Real ID-compliant driver's license, a state ID card, a military ID, or a passport.
The confusion usually comes down to this: a passport proves citizenship and identity to another country, but TSA's domestic rules are separate. A passport works for domestic flights, but it is not the only option, and it may slow your security line because TSA agents have to examine it more carefully than a standard driver's license.
Key Takeaways
- A passport is sufficient ID for any international flight departing from the US, whether you are a citizen or a lawful permanent resident.
- For domestic US flights, a passport works but is not the fastest option — a Real ID driver's license or state ID card moves you through security faster.
- A passport must be valid for the entire duration of your trip; some countries require it to be valid for at least six months beyond your return date.
- If your passport is expired or lost, you cannot fly internationally, but you can still fly domestically with other TSA-approved ID.
- TSA PreCheck and Global Entry programs accept passports as ID, but you still need a Real ID or passport to board the flight itself.
What counts as valid ID for international flights
For international travel, a passport is the primary document. It must be a valid US passport (book or card), and it must not be expired. If your passport expired, you cannot board an international flight, even if you have a ticket. Some countries also require your passport to remain valid for a minimum period after you arrive — commonly six months. Check the entry requirements for your destination country before you book.
If you hold a green card (lawful permanent resident status), you can also fly internationally with your green card and a travel document, though most people use a passport because it is simpler. A passport card (the wallet-sized version) works for flights just as well as a passport book.
Domestic flights and why a passport may not be your best choice
You can use a passport for domestic flights, but TSA does not list it as a primary form of ID. The documents TSA prefers are a Real ID-compliant driver's license, a state ID card, a military ID, or a tribal ID. A passport works because it is a valid government-issued photo ID, but TSA agents may spend extra time verifying it, which can slow your security screening.
Real ID is a federal standard that most states now use for driver's licenses and ID cards. You can tell if your license is Real ID-compliant by looking for a small star or marking in the upper right corner. If you do not have a Real ID license yet, you can still fly domestically with a passport, but you will need to arrive earlier to allow for longer security processing.
Passport validity and expiration rules
Your passport must be valid on the day you fly. An expired passport will not get you through security, domestic or international. For international travel, many countries require your passport to be valid for at least six months after your planned return date — this is called the six-month rule. Some countries are stricter; a few require nine or twelve months of validity remaining.
Check the specific entry requirements for each country you plan to visit. The US State Department website lists entry requirements by country, and your airline may also provide this information when you book. If your passport is expiring soon, renewing it before your trip is simpler than dealing with denial at the airport.
What to do if your passport is lost or expired before your trip
If your passport is lost, you cannot fly internationally. You will need to explore for a replacement at a passport acceptance facility (usually a post office, courthouse, or library) or a passport agency office. Replacement passports take time — routine service is currently four to six weeks, and expedited service is two to three weeks, though these timelines vary. If your trip is very soon, you may need to visit a passport agency in person for a same-day or next-day appointment, which is available only in certain cities.
If your passport is expired, you can renew it by mail if it was issued when you were 16 or older and is not damaged. Mail renewal takes the same four to six weeks. If you need it faster, explore in person at a passport agency. For domestic flights, an expired passport does not work — use a Real ID driver's license or state ID instead.
Using a passport with TSA PreCheck and Global Entry
If you have TSA PreCheck or Global Entry, you can use your passport as ID at the security checkpoint for both domestic and international flights. TSA PreCheck lets you go through expedited screening on domestic flights, and Global Entry speeds you through customs when you return from international travel. Both programs accept a passport as valid ID, so you do not need to carry a separate driver's license if you have PreCheck or Global Entry and a valid passport.
However, you still need the passport itself to board the flight — the PreCheck or Global Entry membership just changes how you move through security. If you are explore for either program, a passport is one of the documents you can use to prove your identity during the process process.
Traveling with a passport and no other ID
If a passport is your only form of ID, you can fly internationally without any problem. For domestic flights, TSA will accept it, though you may experience longer wait times at security. Bring your passport and your flight confirmation to the airport. Arrive at least two hours early for domestic flights and three hours for international flights to allow extra time for security screening if TSA needs to examine your passport more closely.
If you are a US citizen and your passport is your only ID, consider getting a Real ID driver's license or state ID card for future domestic travel. The process is straightforward — visit your state's DMV with proof of identity, residency, and citizenship. A Real ID card makes domestic air travel faster and is also required for entering federal buildings and military bases.
Frequently Asked Questions
Can I fly domestically with an expired passport?
No. An expired passport is not valid ID for any flight. For domestic travel, use a Real ID driver's license, state ID, military ID, or tribal ID instead. If you have no other ID, you will need to renew your passport before flying.
Do I need a passport to fly to Canada or Mexico?
Yes. Both countries require a valid passport for entry. A passport card works for land and sea travel to Canada and Mexico, but for flights you need either a passport book or card. Some US citizens use a NEXUS card or Enhanced Driver's License for land crossings, but those do not work for flights.
What if my passport is valid but damaged or water-damaged?
A damaged passport may not be accepted by TSA or by the destination country. If pages are torn, the photo is damaged, or the binding is broken, explore for a replacement. You can renew by mail if the damage is minor, or explore in person if you need it quickly. Do not attempt to fly with a visibly damaged passport.
Can I use a passport card instead of a passport book for flights?
Yes. A passport card is a valid travel document for flights to any country. It is smaller and fits in a wallet, but it works exactly the same way as a passport book for air travel. The only limitation is that a passport card cannot be used for land or sea travel to Canada, Mexico, Bermuda, or the Caribbean.
Do I need a passport if I have a Real ID driver's license?
For domestic flights, no — a Real ID driver's license is sufficient. For international flights, yes — you must have a valid passport. A Real ID license proves your identity to TSA but does not prove your citizenship to another country.