单次入境柬埔寨签证与多次入境柬埔寨签证：美国人可以获得哪种签证

Validity, stay, and entries — three numbers that are not the same

Three numbers travel together on a Cambodia eVisa, and Americans routinely blur them. Pulling them apart is the fastest way to understand what your visa can and cannot do.

Validity is 3 months from the date the visa is issued. This is your window to make your single entry — the latest date by which you must arrive in Cambodia. If your eVisa is issued on March 1, you must enter by roughly June 1. Arrive on day one of that window or day eighty-nine; either way it is one entry. Validity is a deadline to use the visa, not a measure of how many times you can use it.

Stay is 30 days, counted from the day you actually arrive. This is how long you are permitted to remain inside Cambodia on that single entry. The 30-day stay sits inside the 3-month validity — they are not added together. If you enter on the last day of validity, you still get your full 30-day stay from that arrival date; the validity window only governs when you may enter, not when you must leave.

Entries is the number Americans overlook: one. No matter how much validity or stay remains, you may pass through Cambodian immigration a single time on this visa. Importantly, the automatic tourist extension that some travelers remember reading about ended in November 2025 — so you cannot quietly stretch a single-entry stay the way you might have before. The clean mental model: validity is the deadline, stay is the duration, entries is the count. Single-entry means that count is fixed at one.

When a US traveler actually needs a second visa

Single-entry is only a constraint if your itinerary involves leaving Cambodia and coming back. For a straight in-and-out trip, you will never notice it. But a surprising share of American itineraries do loop — and those are the ones to plan deliberately.

• The Indochina loop. Phnom Penh, then over to Vietnam (Ho Chi Minh City, Hanoi), then back into Cambodia to fly home from Siem Reap or Phnom Penh. The return leg into Cambodia is a second entry, so it needs a second eVisa.
• The regional hub run. Many Americans route through Bangkok or Singapore. If your plan is Cambodia → Bangkok for a few days → back into Cambodia, the return crosses the border again and consumes a fresh entry.
• The work trip with a side meeting. Consultants and supplier-visit travelers who base in Phnom Penh but duck out to a neighboring country for a meeting come back on a new visa. Plan the second one before you leave, not at the airport.
• The beach-then-business split. A leisure week first, fly out, then a separate business trip weeks later — that is two distinct entries and two distinct visas, often one Tourist and one Business.
• The visa run that no longer works the old way. With the auto-extension gone since November 2025, leaving briefly to "reset" your stay simply means re-applying for a full new eVisa to get back in.

The good news is that a second Cambodia eVisa is the same simple process as the first — same $80 USD for Tourist or $90 USD for Business, the same 3-business-day approval, delivered as a printable PDF by email. There is no penalty, no cooling-off period, and no limit on how many single-entry eVisas you can hold across separate trips. If you frequently re-enter and are weighing whether a longer in-country path fits better, our explainer on whether you can still extend a Cambodia tourist visa covers the post-November-2025 rules.

How to plan a clean second entry

If you already know your trip loops out of Cambodia and back, the smart move is to line up the second visa before you ever leave the US — not scramble for it from a hotel in Ho Chi Minh City with patchy Wi-Fi and a flight in 18 hours. Single-entry only bites travelers who plan one visa for a two-entry trip.

Start with the validity math. Each eVisa gives you 3 months of validity from issue to make its one entry. If both your Cambodia arrivals fall inside a 3-month span — which most regional loops do — you can apply for both eVisas at the same time, well before you fly. The first one covers your arrival; the second sits ready for your return. Apply for the return visa close enough to the trip that its validity window comfortably covers your re-entry date.

Then remember the e-Arrival Card. It is separate from the visa and it is per-arrival, which is the detail returning travelers miss most. Two entries into Cambodia means two e-Arrival Cards — one filed within 7 days before your first arrival, a second filed within 7 days before your return. Each is $5 USD verified through us, each is 14 fields, and each is tied to a single arrival. You cannot reuse the first one for your re-entry.

For an extended stay rather than a genuine loop, the calculus changes — a single Business eVisa with an in-country extension can be cleaner than repeatedly leaving and re-entering on fresh single-entry visas. The Business eVisa is the only Cambodia visa that supports in-country extensions, which is why long-stay Americans gravitate to it. Our breakdown of the ordinary E-class visa explains the EB, EG, ER, and ES extension tracks if a longer stay is on the table.

The mistakes that strand US travelers at the gate

Almost every single-entry problem we see on the Returning-Travelers desk traces back to the same handful of misreads. None of them are complicated, and all of them are avoidable with five minutes of planning before you book the loop.

• Treating "valid 3 months" as "multiple entries for 3 months." It is one entry, any time inside that window — not unlimited crossings.
• Assuming leftover stay days survive an exit. They do not. Leaving with 20 days unused does not give you 20 days of re-entry — it gives you nothing without a new visa.
• Forgetting the e-Arrival Card resets each arrival. A returning traveler needs a fresh e-Arrival Card for the second entry, filed in its own 7-day pre-arrival window.
• Booking a Vietnam or Thailand side trip without a return Cambodia visa lined up. The cheapest fix is the second eVisa applied for in advance; the most stressful is realizing it at a foreign airport.
• Expecting an old-style visa run to reset the stay. The auto-extension ended in November 2025, so a quick hop out and back is now a full re-application, not a refresh.

The bottom line for Americans: the Cambodia eVisa is single-entry, full stop — Tourist or Business, the rule is identical. One arrival per visa, 3 months to use it, 30 days of stay once you are in. Plan a second eVisa and a second e-Arrival Card for any trip that leaves and returns, and you will never meet the single-entry rule as an obstacle. If you are still mapping which visa your trip needs in the first place, our which Cambodia visa do I need guide is the place to start.

Next steps and related reading for US travelers: apply for your Cambodia eVisa when your dates are set, bookmark our Cambodia visa hub for US citizens as the single canonical reference, and skim how long US citizens can stay in Cambodia if you are weighing a longer trip.