There are different ways to get to Cambodia. If you choose to do it by air, we have to warn you that there is no national airline and most airports have Asian companies; for example, Thai Airways has international flights between Thailand y Cambodia, Malaysia Airlines from Kuala Lumpur, Vietnam Airlines from Hanoi y Ho Chi Minh y Lao Airlines from Vientiane. The flight from Bangkok a Phnom Penh, lasts about 1 hour and 15 minutes (and from London a Bangkok about 11 hours 20 minutes). The main airports are located in Phnom Penh, y Siem ReapBoth are located 5 miles away from the center of the respective cities. There is no other public transport besides taxis.
If you want to travel by boat, Phnom Penh, y Sihanoukville it has the facilities you need. Can reach Phnom Penh, from Vietnam by Mekong Delta and there is a service of rafts that leave from Bye doc. On the other hand, it can reach Sihanoukville from Thailand, crossing the edge in Hat lek and taking a boat from Koh kong.
Both the border of Vietnam like Thailand They are open to visitors and there is a main track that connects to Phnom Penh, with the Vietnamese border. The border land with Laos. It is not open, however this changes constantly, so we recommend that you find out before starting the trip. You can take a bus in the city of Ho Chi Minh that will take you across the border to Cambodia. It is technically possible to take the road that goes from Ho Chi Minh but also Phnom Penh, and arrive in one day, but there are a number of formalities that you will need to complete. Likewise, in Vietnam It is not allowed to enter with cars that have the steering wheel on the right, although these are very common in Cambodia.