How to get around Cambodia

By plane: Cambodia has 5 airlines offering domestic flights (Bassaka Air, Cambodia Angkor Air, Cambodia Bayon Airlines, JC International Airlines, Sky Angkor Airlines), but there are only 2 routes available. (Phnom Penh and Siem Reap and Siem Reap and Sihanoukville). Plane is still, the fastest way to get around, and there are also 2 private helicopter companies offering scenic and charter flights.

By bus:Buses will take you wherever you wanna go in Cambodia. From luxury air conditioned buses to express minivans. All major cities are now well-linked by bus to Phnom Penh, where you might have to make a stop depending on your destination. Older local minibuses serve most provincial routes but they tend to be really slow and overcrowded. Public buses only work inside Phnom Penh.

By train: Cambodia just recently rehabilitated its rail system, offering only one route (Phnom Penh with Sihanoukville via Kampot) departing only on weekends. 

By car: Car hire is generally only available with a driver (you need a cambodian driver license to drive), although some places in the capital could arrange the license and the car for you. It is still very convenient and is usually the prefered way of transportation for tourists. In Cambodia, Car and motorcycle rental are relatively cheap, but you need to be careful due to the condition of the roads (mostly dirt roads) and some incidents with landmines that have happened in the past. Do not exceed the speed limit. Motorcycle rentals tent to be more popular in here, and there is no driver license needed.