Cambodia is served by two international airports, Phnom Penh and Siem Reap, which operate cheap flights to the surrounding countries via low-cost airlines such as Air Asia. Domestic flights operate between Phnom Penh, Siem Reap and Sihanoukville. Very cheap (sub-$20) flights between Phnom Penh and Siem Reap can sometimes be snapped up by booking in advance with Bassaka Air.
Cambodia has no rail network apart from a recently-opened line between Phnom Penh and Kampot; the way to get from city to city is by long-distance bus.
Several bus companies operate routes between all the major cities, and there are various types of sleeper buses for night journeys. A word of caution though – while Cambodia's roads have improved in recent years, they are treacherous at night and the night bus can consequently be hair-raising.
By tuk-tuks and motorcycles
When it comes to getting around in a town, rent a bicycle or motorcycle, or take advantage of the plentiful tuk-tuks or motorcycle taxis (motodops) who will take passengers across town for a few dollars. Friendly bartering is allowed, but don’t be mean! Drivers in most touristy areas speak a little English.