Get In

All visitors, except citizens of Malaysia, Singapore, Philippines, Laos and Vietnam need a visa to enter Cambodia. The official price for a tourist visa is US$20, and US$25 for a business visa - but expect much higher prices (US$30 or more for the tourist visa) to be demanded at land border crossings.

Visas can be obtained at any Cambodian embassy or consulate overseas. Visas are also available "on arrival" at both international airports, all six international border crossings with Thailand, some international border crossings with Vietnam, and at the main border crossing with Laos.
* Tourist visa: when applied for in advance, these are valid for 90 days (ie must be used within 3 months), and good for a 30 day entry permit stamp which can be extended once only for a further 30 days in Phnom Penh (or elsewhere via agencies) at a cost of US$15.
* Business visa: the best choice for stays over two months and/or multiple entries, as they can be extended indefinitely (approx US$140 per 6 month extension) and have multiple entry status when extended. Most Phnom Penh travel agencies process the extensions.

To apply for a visa, you will need one or two (depending on where you apply) passport-size photo(s) (although when applying on arrival, the fee for not having one is usually only US$1-2), a passport which is valid for at least 6 months and has at least one completely blank visa page remaining, passport photocopies when applying at some embassies/consulates (not needed if applying on arrival), and clean US$ notes with which to pay the fee (expect to pay a substantially higher price if paying in a local currency).

Alternatively, citizens of most nations can now apply for an e-Visa [3] online. The cost is US$25 (US$20 + US$5 processing charge) instead of the normal US$20, and you get the visa by e-mail in 3 business days. For the e-visa you will need one photograph of yourself. You can scan your passport photo (into .jpg format, please!) or take a passport photograph of yourself with a digital camera. Please take note that e-Visa is currently operated by a private Malaysian Company.

The e-visa will come back as a PDF file. You will then need to print out two copies (one for the entry and one for the exit). After printing out your two copies, cut out the e-visa part and put both copies into your passport.

For those entering by air, the e-Visa is valid at both Phnom Penh and Siem Reap airports. It's cheaper to get your visa on arrival at either airport. However if you get a visa in advance (online or from an embassy/consulate) you do get to skip two lines at the airport: the line to apply for the visa, and the line at the cashier to pay the fee. Of course, if you checked luggage, you'll probably have to spend the saved time waiting for your bag.

For those entering overland, do note that overland e-Visa entries are restricted to just three border crossings: Bavet (Svay Rieng) from Moc Bai (Tay Ninh Province, Vietnam); Koh Kong (from Hat Lek / Trat, Thailand); and Poipet (from Aranyaprathet, Thailand). However getting a visa in advance (online or from an embassy/consulate) is definitely the way to go in order to avoid the common scam of visa overpricing at border crossings (see Scam alert).

If you are a foreign national, be aware that you will have to pay an airport departure tax when you leave Cambodia through the airports, about $25 for international flights, it is about $4-6 for internal flights between Phnom Penh and Siem Reap.

Cambodia has international airports at Phnom Penh and Siem Reap. Direct flights connect Phnom Penh International Airport (previously Pochentong International Airport) with China (Guangzhou | Hong Kong | Shanghai), Laos (Vientiane), Malaysia (Kuala Lumpur), Singapore, South Korea (Incheon/Seoul), Taiwan (Taipei), Thailand (Bangkok) and Vietnam (Ho Chi Minh City).

Direct flights connect Siem Reap - Angkor International Airport with Laos (Pakse | Vientiane), Malaysia (Kuala Lumpur), Singapore, South Korea (Incheon/Seoul), Taiwan (Kaohsiung | Taipei), Thailand (Bangkok | U-Tapao (Sattahip/Pattaya)) and Vietnam (Hanoi | Ho Chi Minh City).

Travellers going specifically to visit the Angkor temple ruins may prefer to use Siem Reap as it's only a few minutes away from the main sites; however as Bangkok Airways has a monopoly on direct flights between Bangkok and Siem Reap, it's a lot cheaper to fly to Phnom Penh and to take the bus (or cross overland from Bangkok).

Low-cost carrier Air Asia [6] has introduced flights from Kuala Lumpur and Bangkok to Phnom Penh and Kuala Lumpur to Siem Reap, while Jetstar Asia has begun flying from Singapore to Siem Reap and Phnom Penh.

Other airlines operating flights to/from Cambodia include Asiana Airline , Bangkok Airways , China Southern Airlines , Dragonair , Eva Airways , Korean Air , Lao Airlines , Malaysia Airlines (MAS) , Shanghai Airlines , Siem Reap Airways (a subsidiary of Bangkok Airways), SilkAir , Singapore Airlines , Thai Airways International , and Vietnam Airlines .

From Thailand

All six international border crossings are open 7 AM to 8 PM and all have visa-on-arrival facilities at the Cambodian immigration checkpoints.

On the Thai side, there are good sealed roads to all 6 crossings. There are no direct bus services from Thailand that cross the border, but there are buses to all crossings except Chong Sa-Ngam.

On the Cambodian side, more basic and less frequent bus services are available from Poipet and Koh Kong.

* To Siem Reap & Battambang

The busiest land crossing into Cambodia, and the most convenient for onward travel to Siem Reap and the Angkor Archaeological Park. Long the stuff of nightmares, the road has finally been paved all the way from the border to Sieam Reap and Phnom Penh.

* To Koh Kong & Sihanoukville

Take a bus to Trat (transfer in Chanthaburi if necessary) and from there a minibus to the border. After crossing into Cambodia there are two possibilities - the once-daily boat to Sihanoukville (can be unpleasant in adverse weather), or else a minibus or taxi to either Sihanoukville or Phnom Penh.

Those with a yen for adventure can try out the four other international crossings:
* Chong Sa-Ngam, Si Saket Province - Anlong Veng
* Chong Jom, Surin Province - O'Smach
* To Siem Reap- Take the minibus from Surin bus station to the border. Once you cross the border, you are in the middle of nowhere,and there are not currently any buses direct from the border. A taxi can be hired for the 5 hour journey to Siem Reap, most of it very bumpy. However you will get a great and unique insight into rural Cambodian life away from tourist areas. Be warned, this journey can be difficult during the rainy season.
* Ban Pakard, Chanthaburi Province - Phra Prom, near Pailin
* Ban Leam, Chanthaburi Province - Daun Lem, the geographically closest crossing to Battambang

From Vietnam
* Ho Chi Minh City - Phnom Penh
Through bus tickets cost ~USD$10-12. Bus passengers must walk between the Cambodian and Vietnamese checkpoints and transfer between the two buses that travel the Cambodian and Vietnamese legs respectively. At this crossing only one passport photo is required for a Cambodian visa.
Alternatively, it can be interesting to join a Mekong Delta tour (2-3 days) that travels between the two cities; the total cost is about US$25-35 for three days.
* Ho Chi Minh City - Siem Reap
Mai Linh Taxi Company [22] in Ho Chi Minh City provides bus from Ho Chi Minh City to Siem Reap directly from beginning of 2007. The price is US$18.
* Ho Chi Minh City - Kampong Cham
It is possible to cross at the Trapeang Phlong - Xa Mat border but as of now you have to organise your own transport.
From Laos
* Voeung Kam, Laos - Dom Kralor, Cambodia

Onward transportation not regularly available. Cambodian visas available, but expect 1$ to 2$ of transaction fees on both sides of the border. Travel agencies on both sides have border crossing packages.

To/from Laos

- There is one border crossing for tourists on the Mekong, a 90 minute speedboat ride north of Stung Treng. The border guards have few opportunities for "alternative" income, and will usually try to make a few extra dollars from scamming tourists.

To/from Thailand

- There are no ferry services between Cambodia and Thailand. However it is possible to cross the border from Thailand to Koh Kong on foot, take a 15 minute share taxi or motodop (motorbike taxi) ride, and then proceed to Sihanoukville by ferry from there (or vice-versa).

To/from Vietnam

- It's possible to travel between Ho Chi Minh City and Phnom Penh by boat, or by combination of road and boat. Fast boats leave daily from Chau Doc in Vietnam's Mekong Delta and take 5 hours to reach Phnom Penh. Chau Doc is a four hour drive from Ho Chi Minh City. A popular overland route is to make a three day trip, stopping at Can Tho and Chau Doc before taking the boat to Phnom Penh.

Source:http://wikitravel.org/en/Cambodia