Your choice of transportation within Cambodia will depend on the climate, the distance you wish to travel, the time you have, and the money you want to spend.
Two domestic airlines operate within Cambodia, making daily flights between Phnom Penh and Siem Reap. (A third airline, PMTAir, has suspended its domestic routes for the time being.)
Cambodian Angkor Air - the national flag carrier's office can be found at 1-2 294 Mao Tse Toung Blvd., Phnom Penh, operating between the hours of 8am and 5pm. Phone: +855 23 6666786, +855 23 424 496, or +855 23 990 840.
Royal Khmer Airlines - their main office can be found at #36B, 245 Mao Tse Toung Blvd., Phnom Penh. Phone: +855 23 994 888.
Around the major urban centers - Phnom Penh, Siem Reap and Sihanoukville –the moto (motorbike taxi) is the most common form of public transport. Motos are speedy, cheap, and available everywhere. English-speaking moto drivers are most commonly found around tourist hotspots. Negotiate your price before your trip, whether for a one-off trip or a whole day's service.
Moto drivers won't always know where you want to go, but won't admit their ignorance for fear of losing your fare. Not all of them overcharge, but most will be loath to turn over any change for the fare. Make sure you carry small change if you want to give the exact fare.
Like its motorized counterpart, the cyclo is quite common in the cities – while it’s slower, it’s a far more pleasant and laid back way to get around. Like the moto, you should negotiate the price before beginning your ride.
Taxis are easy to find when arriving at Phnom Penh – they’re lined up outside the arrival hall. Fares from the airport to Phnom Penh will set you back US$7 and the trip will take about 15 minutes, depending on traffic conditions. In Siem Reap, airport-to-town fares cost US$5.
By motorcycleYou might also rent a motorcycle to drive yourself around the city, but be warned: traffic in Phnom Penh is extremely chaotic, and should only be challenged by experienced motorcycle riders.
It's better to rent a motorcycle to visit areas outside of Phnom Penh; renting one will set you back $5-8 a day for a dirtbike, $3-4 for a moto. Do this only if you're willing to chance the nigh-nonexistent medical care in the countryside. Wear a helmet, and slow down in the villages. Animals and children have a nasty tendency to run out into your path, so be vigilant!
Police in Siem Reap have forbidden motorcycle rental outlets from renting cycles to tourists.
By rented car
Nothing beats a rented car for safety and comfort: getting one, driver included, will set you back about US$20-$30 daily. Self-drive car hire is not recommended, giv3n the parlous state of most roads and traffic. Ask your hotel or guesthouse if they can arrange to hire a car for you.
Cambodia’s railway network runs along two lines - from Phnom Penh to Battambang, and from Phnom Penh to Sihanoukville. The trains are old and decrepit, and the tracks are constantly under repair. Still, this is a cheap and scenic way to travel, and you'll get to meet a lot of locals you'll never otherwise encounter. While this is slow going, you’ll have a view of the countryside and the coast that no other travelers will ever see. Inquire at the station for the train schedule.
The rapidly developing bus services in Cambodia offer low-cost travel to key cities in the country. From Phnom Penh, you can catch a bus to Siem Reap (six hours, $4), Sihanoukville (four hours, $4), or Battambang (six hours, $4). Bus services also run from Phnom Penh to Cambodia border crossings - Moc Bai (Vietnam) and Poi Pet (Thailand) among them.
You can ride from Phnom Penh to Siem Reap and back on the ferries that cross the Tonle Sap Lake. Trouble is, most of them charge exorbitant rates (about $25), don’t meet international safety standards, and set you up for extreme overcrowding.
You can ride a boat from Siem Reap to Battambang and back, although it's a far second choice next to the land route. Better to take the boat connecting Koh Kong to Sihanoukville; this is the best way to travel between the two points when the monsoon season makes the roads almost impassable.
By pick-up and share taxi
They're crowded but effective vehicles on Cambodia's hellish roads, traversing country lanes to far-flung towns like Koh Kong. Share taxis often ply the same routes; look for them at Phnom Penh's central market, where you can either hire them solo or share the ride with other passengers going your way.