The core difference: what each document does
A passport is a travel document issued by the U.S. State Department that proves your citizenship and identity to foreign countries. It works for international air travel, sea travel, and land border crossings. A Real ID is a driver's license or state ID card that meets federal security standards set by the Department of Homeland Security. It works for domestic air travel and entry to federal buildings, but not for international travel.
The confusion arises because both can get you on a domestic flight. But they serve different purposes and have different requirements. A passport proves you are a U.S. citizen to another country. A Real ID proves you are who you say you are to a federal agency within the U.S.
If you only fly domestically and never cross a border, you need a Real ID or a passport. If you travel internationally, you need a passport. You can have both at the same time — they do not replace each other.
Key Takeaways
- A passport is required for any international travel by air, sea, or land; a Real ID is required only for domestic flights and federal building entry as of May 7, 2025.
- Passports take 6 to 8 weeks for routine processing or 2 to 3 weeks for expedited processing; Real IDs take 1 to 4 weeks depending on your state.
- A passport costs $130 to $165 for adults; a Real ID costs $15 to $100 depending on your state and whether you renew your driver's license at the same time.
- You can use a passport for domestic flights instead of a Real ID, but you cannot use a Real ID for international travel.
- If you have neither document, a passport is the better choice if you travel internationally at all; a Real ID is sufficient if you only fly domestically.
When you need a passport instead of a Real ID
You must have a passport for any international travel. This includes flights to Canada, Mexico, the Caribbean, Europe, or anywhere outside the United States. You also need a passport to enter the U.S. by air from a foreign country, even if you are a U.S. citizen. A Real ID will not work for this.
If you travel by sea — cruise ships, ferries to Canada or Mexico — you may be able to use a passport card (a smaller, wallet-sized version of a passport) instead of a full passport book. However, some cruise lines and ferry operators have their own rules, so check before you book.
Land border crossings to Canada or Mexico require a passport, passport card, or a NEXUS card (a trusted traveler program). A Real ID alone is not sufficient for land borders, even though you might assume it would be.
When a Real ID is enough and a passport is not required
A Real ID is sufficient for domestic flights within the United States. Starting May 7, 2025, you will need either a Real ID, a passport, a passport card, a military ID, or a Native American tribal ID to board a domestic flight. A standard driver's license or state ID without the Real ID security features will no longer work.
A Real ID is also required to enter federal buildings, military bases, and nuclear power plants. If you work in or frequently visit these locations, you need a Real ID or another federally accepted ID.
If you never travel internationally and do not need to enter federal buildings, a Real ID is the simpler and faster route. You do not need a passport for these purposes.
Processing time and cost comparison
| Document | Routine Processing | Expedited Processing | Cost (Adult) | Issued By |
|---|---|---|---|---|
| Passport Book | 6–8 weeks | 2–3 weeks | $130–$165 | U.S. State Department |
| Passport Card | 6–8 weeks | 2–3 weeks | $35–$50 | U.S. State Department |
| Real ID Driver's License | 1–4 weeks | Not typically available | $15–$100 | Your State DMV |
Passports are processed by the State Department and take longer because they are federal documents. If you need a passport quickly, you can pay extra for expedited processing, but you must still wait 2 to 3 weeks minimum. Some passport acceptance agencies offer same-day or next-day service for passport cards only, not full books.
Real IDs are processed by your state DMV and are usually faster because they are state documents. However, processing times vary by state. Some states process Real IDs in 1 to 2 weeks; others take 3 to 4 weeks. Check your state DMV website for the current timeline.
If you need a document urgently and only fly domestically, a Real ID is the faster choice. If you need to travel internationally, a passport card is faster than a passport book but still takes weeks.
Documents you need to bring for each
For a passport, you need proof of citizenship (birth certificate, naturalization certificate, or previous passport), a government-issued photo ID, proof of your Social Security number, and a completed process form (DS-11 for a new passport or DS-82 for renewal). You also need a passport photo taken to specific State Department standards. If you are renewing by mail, you may not need to appear in person.
For a Real ID, you need proof of identity (driver's license, passport, or birth certificate), proof of Social Security number (Social Security card, W-2, or tax return), and proof of your current address (utility bill, lease, or bank statement). You must appear in person at your state DMV. Some states also require proof of citizenship or a lawful presence document if you were not born in the U.S.
The Real ID document list is shorter and easier to gather than a passport's. However, if you already have a passport, you can use it as your proof of identity and citizenship for a Real ID, which may speed up the process.
Can you use a passport for domestic flights instead of a Real ID?
Yes. A valid passport book or passport card works for domestic flights and counts as a federally accepted ID. You do not have to get a Real ID if you have a passport. However, carrying a passport through airport security and keeping it safe during a domestic trip is less convenient than carrying a driver's license.
If you travel internationally even once every few years, getting a passport makes sense because it serves both purposes. If you only fly domestically, a Real ID is more practical because it is your driver's license and you carry it anyway.
A passport card is smaller and easier to carry than a passport book, but it is only valid for land and sea travel to Canada, Mexico, and the Caribbean — not for air travel. Do not confuse the two.
Which document to get first if you need both
If you travel internationally and also need a Real ID for domestic flights, get the passport first. A passport takes 6 to 8 weeks, and you cannot rush it much. A Real ID takes 1 to 4 weeks, so you can get it while waiting for your passport to arrive. This way you have a valid ID for domestic flights while your passport is being processed.
If you are in a hurry and only need a Real ID for an upcoming domestic flight, skip the passport and go straight to your state DMV. You can always get a passport later if your travel plans change.
If you are renewing your driver's license anyway, ask your DMV whether they can issue a Real ID at the same time. Many states do this automatically or for a small additional fee. This saves you a trip and gets both documents done faster.
Frequently Asked Questions
Can I use my passport instead of getting a Real ID?
Yes, a valid passport works for domestic flights and federal building entry. However, if you only fly domestically and do not travel internationally, a Real ID is simpler because it is your driver's license and you already carry it. A passport is an extra document to manage.
What if my passport expires while I am traveling domestically?
An expired passport is not valid for any travel, domestic or international. You cannot board a domestic flight with an expired passport. Renew your passport before it expires, or switch to a Real ID for domestic flights.
Do I need both a Real ID and a passport?
Only if you travel internationally and want to use your driver's license for domestic flights. If you have a passport, you can use it for both domestic and international travel and skip the Real ID. If you only fly domestically, you need only a Real ID.
Is a passport card the same as a Real ID?
No. A passport card is a travel document for land and sea travel to Canada, Mexico, and the Caribbean. It does not work for domestic flights. A Real ID is a driver's license that works for domestic flights and federal buildings. They are completely different documents.
What if I lose my passport or Real ID while traveling?
For a passport, contact the nearest U.S. embassy or consulate when ready. For a Real ID, contact your state DMV. Both can issue emergency replacements, but the process varies. Have a backup form of ID (credit card, insurance card) in case you need to prove your identity while waiting for a replacement.