Cambodia eVisa for Dual Citizens: Which Passport Should Americans Use?

Why the US passport is usually the cleaner pick

Both passports get you into Cambodia on an eVisa — the choice is rarely about eligibility and almost always about which one keeps the rest of the trip frictionless. For most dual-national Americans, the US passport wins on practical grounds, and here is the reasoning rather than a blanket rule.

• Validity headroom. US passports are issued for 10 years and most Americans renew before they get tight, so the US passport is usually the one with the longest runway left — and Cambodia wants at least 6 months of validity from your date of entry.
• Airline expectations. US carriers and most international airlines flying Americans home expect the trip to begin and end on the US passport. Booking and boarding on the same document you applied on removes a layer of questions at check-in.
• No special hurdle. US citizens face no extra Cambodia entry requirement that a second nationality would let you sidestep — the eVisa terms, fee, and 30-day single-entry stay are identical, so there is nothing to gain by entering on the other passport.
• Re-entry to the US. You will need your US passport to clear US Customs and Border Protection on the way home regardless, so carrying and traveling on it the whole way keeps one document in play instead of juggling two.
• Consular backup. If anything goes wrong abroad, the US Embassy in Phnom Penh assists US citizens — traveling on the US passport keeps that support line clean.

There are sensible reasons a dual national might choose the other passport instead — your US passport is within 6 months of expiry while the second one is fresh, or your flights are already booked on the non-US document, or your second nationality is the only one currently in your hand. All of those are fine. The rule does not say "always use the US passport." It says "apply on, and travel on, the same one." If the second passport is the one you will actually present, apply on that, and make it your single passport for the whole trip.

Whichever you land on, confirm it clears the basics before you apply: at least 6 months of validity from your arrival date and a blank page for the stamp. Our rundown of Cambodia passport requirements for Americans covers the validity and condition rules, and the full Cambodia eVisa documents checklist for Americans lists everything else you upload alongside it.

The trap: switching passports between entry and exit

The single mistake that turns dual citizenship into a problem is using one passport to enter Cambodia and a different one to leave — or boarding on one and presenting the other at Immigration. It feels harmless. It is not. Cambodia stamps the passport you enter on, and the exit check expects to see that same stamped passport on the way out. Hand over the other one at departure and the officer finds no Cambodia entry stamp in it, which reads as someone who entered without being recorded.

The same logic applies the moment you board. If your eVisa is on your US passport but you instinctively hand the gate agent your second passport because it was on top in your bag, the airline cannot match a valid Cambodia eVisa to the document you presented, and they can deny boarding before you ever leave the US. Airlines are liable for carrying passengers who will be refused entry, so they check carefully — and a dual national flashing the wrong passport is precisely the case they are trained to catch.

The fix is a habit, not a document. From the moment you apply, decide which passport is your "travel passport" for this trip, and put the other one away. Book the flights on it. Apply for the eVisa on it. File the e-Arrival Card on it. Carry it in the same pocket every time you reach a counter. Leave the second passport zipped in your bag as backup only. If you never take it out at a checkpoint, you can never accidentally create the mismatch.

This is also why the entry point you choose on the application matters: the airport you select needs to be one your single travel passport can actually use, and the same passport carries you through Immigration there. Our guide to the Cambodia eVisa eligible entry points for US citizens lists the air and approved arrival options, which is the context the passport choice sits inside.

When your two passports spell your name differently

Plenty of dual nationals have passports that do not agree on the name. A US passport might read "JOHN ANTHONY REYES" while a Filipino passport reads "JOHN REYES SANTOS," with the maternal surname appended in the local convention. A US passport might Anglicize a name that the other country renders with diacritics or a different transliteration. None of this is a problem for Cambodia as long as you respect the one rule: the name on your eVisa application must match the passport you apply on, exactly as that passport prints it in the machine-readable zone.

So do not "harmonize" the two. Do not blend the US first name with the other passport surname because it looks more complete. Type the name precisely as it appears on the single passport you have chosen to travel on — same spelling, same order, same characters the scanner reads. The eVisa then matches that passport at the gate, and the existence of a differently-spelled name in your other passport is irrelevant because that passport never comes out of your bag.

Diacritics and special characters are worth a specific note. If your chosen passport shows accented letters or characters outside the basic Latin set, follow how that passport renders them in its machine-readable zone — that bottom strip uses a standardized substitution (for example, dropping accents), and matching the MRZ is what the system checks. When in doubt, copy the bottom MRZ lines rather than the decorative printed name at the top.

If a name genuinely will not reconcile — a recent legal name change, a passport mid-renewal, a transliteration you are unsure about — sort it before you fly rather than at the kiosk. Our walkthrough on fixing wrong information on a Cambodia eVisa covers how a correction is handled, and free resubmission means a flagged name is fixed at no extra charge if Immigration asks.

The e-Arrival Card has to name the same passport

There is a second document in the 2026 entry process that catches dual nationals who got the eVisa right: the Cambodia e-Arrival Card. It is a separate, mandatory digital form for every air arrival, and it asks for your passport details just like the eVisa does. The card and the visa have to agree. If your eVisa is on your US passport but you fill the e-Arrival Card using your second passport — maybe because it was the one you grabbed — the kiosk sees two documents pointing at two different people, and that is a fast way to get sent back to a help desk.

Treat the e-Arrival Card as the same passport, second form. Whatever passport your eVisa is built on, that is the passport number, nationality, and name that goes on the 14-field card, submitted within the 7-day window before you fly. One passport drives the eVisa, the e-Arrival Card, the boarding pass, and the entry stamp. Keep them all on the same document and the dual-citizenship angle disappears entirely.

If a family is traveling and only some of you are dual nationals, the principle holds per person: each traveler files their own e-Arrival Card on the same passport their own eVisa is on. Our walkthrough of the Cambodia e-Arrival Card for US citizens covers the timing and the fields, including the ones travelers most often get wrong.

Putting it together before you apply

Here is the whole thing in one breath: choose one passport, apply on it, travel on it, and never swap. For most dual-national Americans that passport is the US one — longest validity, what the airline expects, and what you need to re-enter the US anyway — but the second passport is fine too as long as it is the single document you use for the eVisa, the e-Arrival Card, boarding, entry, and exit. The Tourist eVisa is $80 USD all-in and the Business eVisa is $90 USD all-in, both approved in 3 business days and delivered as a printable PDF by email. If your second nationality has you wondering whether you even need a visa, the do dual citizens need a Cambodia visa explainer answers the eligibility side directly.

One reminder before you start: the visa is one form and the e-Arrival Card is a different form, and both must name the same passport. The visa application happens now; the e-Arrival Card happens within 7 days before you fly. Dual nationals who lock in their travel passport at the very start avoid the most common 2026 trip-stopper — a passport mismatch at the kiosk. Confirm the document basics first in our Cambodia passport requirements for Americans, then apply when your chosen passport and a photo are in front of you.

Next steps and related reading for dual-national Americans: apply for your Cambodia eVisa on your chosen passport when you are ready to lodge, bookmark our Cambodia visa hub for US citizens as the single canonical reference, read whether dual citizens need a Cambodia visa for the eligibility picture, and check the Cambodia eVisa documents checklist for Americans so the passport you pick clears every requirement before you upload.