Cambodia has three major airports through which you can enter the country: Phnom Penh International Airport, Siem Reap International Airport, and Sihanoukville International Airport. The former is definitely the largest in the country and also serves as main base for the Cambodian Air Force. Additional smaller airports (not all with paved runways) allow you to reach even remote areas of the country.
Airlines in Cambodia
There are two airlines in Cambodia: Angkor Air offers connections to various Cambodian cities and other Asian destinations, such as Shanghai, Guangzhou, Seoul, or Singapore. Aero Cambodia, on the other hand, focuses mainly on freight and charter services. They transport up to 19 passengers and specialize in microlight flights. Of course, lots of other international airlines connect you to Cambodia as well.