How Long Can US Citizens Stay in Cambodia on an eVisa?

Validity vs stay — the three months people misread

Here is where almost every American mix-up happens. The eVisa is valid for 3 months. People read that as "I can stay for three months," and that is simply not what it means. The three months is the validity window — the shelf life of the document, the deadline by which you have to arrive and use it. The stay is a separate, shorter number: 30 days, and it only begins once you enter.

Think of it as a movie ticket. The ticket is valid until a certain date — that is your three months. But the film itself only runs for a set length once you walk into the theater — that is your 30 days. Buying the ticket early does not shorten the film, and holding it for two months does not give you a longer screening. The two numbers describe different things, and they never add together.

A worked example makes it concrete. Say your eVisa is issued on March 1. It is valid through June 1 — that is the latest you can arrive. If you fly in on May 20, your 30-day stay runs from May 20, giving you until June 18 inside the country. The fact that your visa was technically valid through June 1 is irrelevant once you are stamped in; the stay clock has its own 30 days that override the validity date. You do not lose the difference, and you do not gain it — the stay is always 30 days from entry, full stop.

The practical takeaway for US travelers: apply whenever it is convenient, because the three-month window is wide and the stay clock does not start until you arrive. There is no penalty for applying early and no advantage to cutting it fine — the eVisa is approved in 3 business days and then simply waits for you.

Single entry — why leaving ends the visa early

The Cambodia eVisa is single entry, and this is the rule that surprises Americans planning a multi-country Southeast Asia loop. Single entry means exactly one admission into Cambodia. The moment you cross out — to Vietnam, to Laos, to a regional flight — your eVisa is spent. It does not matter that you still had 18 days left on your 30-day stay; once you exit, those days are gone with the visa, and coming back requires a brand-new eVisa.

This catches people on itineraries that look harmless on paper. A traveler plans Phnom Penh, then a few days in Ho Chi Minh City, then back to Siem Reap for the flight home. That "back to Siem Reap" leg is a second entry into Cambodia, and the single-entry eVisa does not cover it. You would need a second eVisa for the return — or to restructure the trip so Cambodia is one continuous block with no exit in the middle.

If your trip genuinely requires leaving Cambodia and coming back, the clean fix is to apply for a second eVisa before you travel, so the return-entry document is already in your inbox. The other option is to choose a multi-entry-capable visa from the start, which is a Business eVisa decision rather than a Tourist one. Our breakdown of single-entry vs multiple-entry Cambodia visas for Americans lays out exactly which scenarios justify which choice, so you are not buying coverage you do not need.

The good news is that for the typical American trip — fly in, see Angkor Wat and Phnom Penh, fly home — single entry is a non-issue. Cambodia is one continuous stay, you never exit mid-trip, and the 30 days are more than enough. Single entry only matters when your route loops out and back, and even then the fix is simply knowing about it before you book the connecting flight.

Staying longer than 30 days — the route that works

If you need more than 30 days in Cambodia, the most important thing to understand is what changed in 2026. For years, tourists could top up their stay at the airport through an automatic extension, and a lot of older advice still assumes it exists. It does not. The tourist auto-extension ended in November 2025, which means the Tourist eVisa now caps out at 30 days with no in-country path to add more. Trying to extend a Tourist eVisa today is a dead end.

The visa that can be extended is the Business eVisa. It costs $90 USD all-in, is approved in the same 3 business days, and looks almost identical to the Tourist eVisa at the application stage — but it is the version that can be extended in-country once you are in Cambodia, in blocks that can run well beyond a single month. For Americans planning a long stay, a remote-work stint, a volunteering placement, or repeated back-to-back trips, choosing the Business eVisa at the start is the difference between a stay you can extend and one you cannot.

The key decision happens before you apply, not after you arrive. You cannot convert a Tourist eVisa into an extendable one once you are stamped in, so if there is any real chance you will want more than 30 days, start on the Business eVisa. Our guide on whether you can still extend a Cambodia tourist visa in 2026 covers the post-November-2025 rules in full, and our walkthrough of the Business eVisa for US citizens explains the version that does extend.

And a blunt word on the alternative some travelers consider: overstaying. Do not. Cambodia charges a per-day fine for every day past your 30-day stay, payable at departure, and a flagged overstay can complicate a future entry. With the auto-extension gone, there is no soft buffer anymore — day 31 is an overstay, plainly. If your trip is genuinely longer than a month, the cost of the right visa up front is trivial next to the Cambodia visa overstay fines you will face at the airport.

Putting the timeline together

The clean summary for any American planning a 2026 trip: your eVisa is valid for 3 months from issue (the window to arrive), and once you are stamped in you get a 30-day stay, single entry, counted as calendar days with arrival day as day one. Thirty days is now a hard ceiling on the Tourist eVisa because the auto-extension ended in November 2025. Leaving Cambodia spends the visa, even with days left. And if you need longer than a month, the Business eVisa is the one that can be extended in-country — a decision you make before you apply, not after you land.

Next steps and related reading: apply for your Cambodia eVisa when you are ready to lodge, confirm whether US citizens need a visa for Cambodia if you are still deciding, read up on single-entry vs multiple-entry visas if your route loops out and back, and check the current extension rules so the 30-day limit does not surprise you. The Tourist eVisa is $80 USD all-in and the Business eVisa is $90 USD, both approved in 3 business days and delivered as a printable PDF by email.