Vietnam and Cambodia Together: How to Combine Them

Vietnam and Cambodia are neighbours, the flights between them are short and cheap, and Angkor is close enough to the southern end of Vietnam that combining the two is one of the most common long trips in the region. The combination is straightforward. The visa sequencing is where people come unstuck.

The visa decision, first

Settle this before the tickets rather than after, because the shape of the trip determines what you apply for. The entry and exit location on an e-visa must match the port chosen in the application. The entry you make must match the entry port you named, and the exit you make must match the exit port you named — so an e-visa naming Tan Son Nhat as its exit does not get you out at a land or river border, and an error on either field can mean refused entry.

So the shape of the trip decides the visa. If you enter Vietnam by air and leave by air, name the airports. If you plan to cross overland or by river to Cambodia, the visa has to name that crossing as its exit. Get the ports right at the application stage, because they are not something to sort out at the border.

Duration is a separate matter with its own rule: Vietnam does not allow you to renew or extend an e-visa while you are in the country. If you want longer than you applied for, that means leaving and applying again from outside.

If you return to Vietnam

A single-entry visa is spent when you leave. Vietnam, then Cambodia, then Vietnam again needs either a valid multiple-entry visa covering the return, or a second visa approved before you come back, applied for from outside Vietnam. An application in progress is not permission to enter.

Cambodia's own rules are set by Cambodia and change independently; check them with the Cambodian authorities rather than with a tour operator.

The three shapes that work

Vietnam north to south, then Cambodia, out of Phnom Penh or Siem Reap. The cleanest version. Fly into Hanoi, work down the country, cross to Cambodia from Ho Chi Minh City or the delta, and fly home from Siem Reap. One Vietnamese entry, one exit, no backtracking.

Cambodia first, then Vietnam south to north, out of Hanoi. The same thing reversed, and the better choice if the cheap flight lands you in Cambodia.

Vietnam, Cambodia, Vietnam. Only if you have a specific reason, because it is the version that needs either multiple-entry permission or a separately approved second visa, plus an extra border crossing. Usually the reason is a return flight you cannot change.

How to cross

By air is the simplest: Ho Chi Minh City to Phnom Penh is about an hour in the air, and to Siem Reap not much more. Hanoi to Siem Reap and Phnom Penh also run. An airport entry is the straightforward case for both countries' paperwork.

By road through the Moc Bai crossing, buses run from Ho Chi Minh City to Phnom Penh in six to seven hours. By river, boats run from Chau Doc in the Mekong Delta up to Phnom Penh, which takes most of a day and turns the transfer into part of the trip.

How many days each

Cambodia's essential list is shorter than Vietnam's. Siem Reap and Angkor need three days to be done properly — two is possible and rushed. Phnom Penh needs two, including Tuol Sleng and Choeung Ek, which are heavy and should not be compressed into a morning.

So a minimum useful Cambodia leg is five or six days on the ground. Against Vietnam's ten to fourteen, that makes a combined trip three weeks rather than two. Two weeks across both countries means doing Vietnam in a week, which is two regions, and Cambodia in five days.

The common mistake

Adding Angkor to a two-week Vietnam trip as a three-day excursion. Allow a day for the transfer at each end, three for Angkor, and you are down to about nine days for Vietnam — which is three regions at the pace of the ten-day plan, not two weeks' worth. Something has to be cut and it is better to decide which than to discover it.

What Cambodia adds that Vietnam does not have

Angkor, principally. There is nothing in Vietnam at that scale, and the Cham towers at My Son — which are the closest relatives architecturally — are a fraction of the size and much more ruined. Seeing My Son after Angkor makes it feel small; seeing it before makes Angkor overwhelming. Either order works, and the order you choose changes both.

Phnom Penh's Khmer Rouge sites are the other thing. They are heavier than Vietnam's war sites and they are closer in time, and a trip that includes both needs some space between them rather than four days of difficult material in a row.

Practical points

Currencies differ: Cambodia uses the riel alongside US dollars, and small dollar notes are genuinely useful there in a way they are not in Vietnam. Carry some.

The climates are similar and the seasons broadly align — the southern Vietnamese wet season from roughly May to October overlaps Cambodia's, and Angkor in the wet months is greener, quieter and punctuated by afternoon downpours.

Booking order

Work out the crossing first, because it determines the visa. Then apply for the Vietnamese e-visa naming the right ports. Then the international flights, open-jaw into one country and out of the other. Then the internal flights, then accommodation.

How Vietnam fits into a longer Southeast Asia route, with Laos or Thailand on it as well, is a question Vietnam, End to End works through.