Flying internally is quick way to get around Cambodia. However, after PMT Air’s suspension of domestic flights to upgrade its fleet, the one left flying between Siem Reap and Phnom Penh is Siem Reap Airways International. The flight lasts 45 minutes. The baggage allowance is only 10kg per passenger. The airports are only a 6-10 minute ride to the cities.
Traffic drives on the right in Cambodia and road condition is variable. Highways are numbered and National Highways 1 and 2 go from Phnom Penh to the Vietnam border. Care should be taken as accidents occur frequently and it is doubtful anyone follows road rules. Assume that size matters and the bigger vehicle wins. Also do not assume that local drivers will use headlights at night. It is best to hire a car with a driver for travel around the major cities, and chauffeured travel into the provinces can be arranged.
Motorcycles are preferred for getting around in the cities; be aware that livestock often stray onto the roads. Other options are taxis (negotiate the price before hand), cyclos, motos and motorized tuk-tuks.
Bus services have improved in leaps and bounds with continual road upgrade. Phnom Penh Sorya Transport offers cheap, and comfortable long-distance buses between Phnom Penh to Sihanoukville, Battambang, Poipet, Sisophon, Kratie, Siem Reap and Kampong Cham, among others. A multi-lingual staff speaks English, Chinese, Thai and Vietnamese.
Travel by boat is a good option as Cambodia has miles of navigable waterways. The 5-hour trip between Phnom Penh and Siem Reap is popular with tourists; be advised that boat services can be suspended in the dry season. Those wanting to get to Thailand use the fast boat between Sihanoukville and Krong Koh Kong and a scenic route is found between Siem Reap and Battambang.