As Cambodia’s road system has improved, buses have quickly become the preferred form of inter-provincial transportation. Several bus companies offer comfortable a/c buses from Phnom Penh to all of the most popular provincial destinations including Siem Reap, Sihanoukville and many other provincial capitals and other towns along the National Routes. There are also a limited number of bus routes between provincial cities (for example Sihanoukville/Kampot, Kampong Cham/Siem Reap, etc.) And there are now direct buses running internationally between Phnom Penh and Ho Chi Minh City. All of the major bus companies use comparatively good quality, a/c buses, and some companies offer deluxe buses - slightly more expensive, usually newer and with tour guide, snacks, on-board toilet and other amenities. Generally speaking, it is easiest to buy bus tickets through your guesthouse or travel agency, though you can buy it directly from the bus company office as well.
Bus Companies and Bus Stations
There is no centralized bus station in Phnom Penh. Buses from different companies depart from different stations. Some buses depart/arrive from the bus company office, others from remote bus stands such as market parking lots. One of the largest bus stations in Phnom Penh - Phnom Penh Sorya Transport - is next to Phsar Thmey (Central Market), near the GST bus station and major taxi stands. Several bus company offices are also concentrated near Street 104 and Sisowath Quay on the riverfront. The rest are scattered around town. In most provincial cities, including Siem Reap and Sihanoukville, there is a centralized bus station from which all buses arrive and depart. The following list is not comprehensive but does include most of the major bus companies.