Where Americans can travel without a passport, and the catch in each case

A US citizen can fly to Puerto Rico, the US Virgin Islands, Guam or the Northern Mariana Islands with no passport at all, because travelling between the US and its territories is not leaving the country. American Samoa asks for a passport or a certified birth certificate. A closed-loop cruise — one that leaves from and returns to the same US port — lets you back in with a birth certificate and a photo ID. Each of those comes with one condition that people discover at the worst possible moment, and they are all below.

The full list, and what each one needs

Five territories, one kind of cruise, and a land border that accepts a card instead of a book. These are the federal rules as USA.gov and US Customs and Border Protection publish them.

The catch with the territories: the word “directly”

The no-passport rule holds only while you stay inside the US on the way there and back. Customs and Border Protection says that citizens returning directly from a territory are not considered to have left the country. Route through a foreign airport and that stops being true: re-entering the US by air from abroad requires a passport, whatever your final destination was.

For Puerto Rico and the Virgin Islands this rarely matters, because most travellers fly directly from the mainland. For Guam and the Northern Mariana Islands it matters much more, because some routings connect through airports in Asia such as Tokyo, Seoul or Manila. Check the connecting airport before you decide you can leave the passport at home.

And you still need ID at the airport itself. Since 7 May 2025, TSA checkpoints have required a REAL ID-compliant licence or another accepted document such as a passport, so an old-style driving licence will not get you through security to a territory flight.

The catch with cruises: the flight you did not plan

A birth certificate gets you back on the ship’s return to port, and nowhere else. The closed-loop rule is generous for the trip as planned. But if you are injured, fall ill, miss the ship at a foreign port or have to rush home for a family emergency, you will be flying back to the US from another country — and that flight needs a passport. The cruise line can also set stricter rules of its own.

This is the unprofitable advice nobody selling the cruise wants to give: if you can get a passport before you sail, get it. The birth-certificate route is legal and it works right up until the day something goes wrong. How much a US passport actually opens up is in our piece on where the American passport ranks.

The land border: a card, not a book

Driving or sailing to Canada or Mexico accepts a cheaper document, and only for that. The passport card and the Enhanced Driver’s License, which only some states issue, are valid at land and sea crossings under the Western Hemisphere Travel Initiative. Neither works for an international flight. If a road trip over the border is the plan, check the state-by-state advisory for Mexico or what cross-border traffic looks like right now before you go.

Do US citizens need a passport for Puerto Rico?

No. Puerto Rico is a US territory and citizens can travel there directly without one. You will still need a REAL ID-compliant ID or a passport to pass TSA security.

Can I go on a cruise without a passport?

On a closed-loop cruise that starts and ends at the same US port, yes: CBP accepts a birth certificate with a government-issued photo ID. If you need to fly home from a foreign port, you will need a passport.

Do I need a passport for Guam?

Not if you travel directly from the US. If your flight connects through another country, you will need a passport to re-enter the US by air.

Do I need a passport for American Samoa?

Yes, or a certified US birth certificate. It is the one US territory with an entry document requirement.

Sources: USA.gov guidance on travel to US territories and the Freely Associated States; US Customs and Border Protection, Western Hemisphere Travel Initiative and its guidance on returning from territories; TSA REAL ID enforcement. Rules checked 21 September 2026 — confirm with your airline or cruise line before travel.

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