Phnom Penh to Sihanoukville: the expressway changed everything — bus, minivan, train or taxi compared

Last updated: November 3, 2026 · By Wander Cambodia

Phnom Penh to Sihanoukville used to be one of Cambodia's dreaded journeys — five or six hours on a broken two-lane highway. The Phnom Penh–Sihanoukville Expressway, the country's first, cut it to a drive of about two and a half hours, and the bus and minivan companies followed it down. Today the trip runs about 3–4 hours by bus or minivan for roughly $13–16, about 6½ hours by the daily train for about $11–12, or door to door by taxi. Almost everyone on this route is really heading for the islands — our Sihanoukville guide covers the city itself honestly, and this page covers getting there.

The options at a glance

Expressway bus: about 3–4 hours, roughly $13–16, with departures through the day from companies such as Giant Ibis and Airbus. Comfortable, air-conditioned, the default choice. Shared minivan: about 3–3½ hours, roughly $15, run by operators such as Larryta Express and Virak Buntham Express — a little faster, a little tighter. Train: about 6 hours 36 minutes, once daily, roughly $11–12 — the cheapest seat and the slowest journey, and a trip in itself. Private taxi: about 2½–3 hours of driving on the expressway, typically quoted around $60–80 for the whole car through booking platforms, sometimes more at the kerb. Flying exists on paper between the two cities' airports but schedules are thin and unreliable; plan on the road. Prices move and timetables change — treat these as the current typical ranges and check live schedules when you book, the same way we advise on the Kampot route, which shares the southern line.

The expressway bus and minivan, in practice

The expressway is the story here: a modern toll motorway of about 190 kilometres that removed the old National Road 4 ordeal entirely. Buses now run the route in the time a capital-to-coast trip should take, and the competition keeps the standard decent — reclining seats, air conditioning that mostly works, and a rest stop rather than a mystery halt. For island connections, timing is the real decision: ferries to Koh Rong and Koh Rong Sanloem leave Sihanoukville's piers through the morning and early afternoon, and the last useful boats are gone by mid-afternoon. Work backwards from the boat. A bus that lands you in Sihanoukville by late morning connects cleanly; one that arrives at 4pm buys you a night in the city whether you wanted it or not. Book the departure a day ahead in the December–February peak, keep small notes for the rest stop — the dollars-or-riel answer explains the pocket money system — and keep valuables in your day bag, not the hold.

The train: slow, cheap, and quietly lovely

The southern line leaves Phnom Penh once a day and takes about six and a half hours through Takeo and Kampot country to Sihanoukville, for roughly $11–12. Nobody takes it to save time; people take it because it is the gentlest way to cross southern Cambodia — rice fields, sugar palms and village stations instead of motorway. The refurbished KiHa trains that run on some days are noticeably more comfortable than the regular stock. It is the right choice when the journey is part of the trip and the wrong one when a ferry leaves the same afternoon: if the train runs late, the islands wait for nobody. Pair it with the northern line instead if rail is the point — our Phnom Penh to Battambang guide covers that run — and treat the southern train as a one-way treat, flying or busing back.

The taxi, and the island-connection maths

A private taxi is the fastest door-to-door option and the best one for groups: split four ways, the per-person cost lands close to minivan money for a car that leaves when you say. It is also the only option that reliably saves a tight ferry connection, because it can run straight to the pier rather than the bus station. Agree the full price, the car, and the pier drop-off before you leave Phnom Penh, and remember the expressway tolls are part of the driver's maths, not a surprise extra to renegotiate mid-motorway. Coming back, the same road runs in reverse — and if your trip continues south rather than returning to the capital, Sihanoukville to Kampot is a short hop covered by the southern corridor in our Kampot and Kep guide.

Stations, piers and the last mile

The details that decide whether the trip feels easy. In Phnom Penh, the expressway buses and minivans leave from company stations scattered across the city centre rather than one central terminal — check your booking for the actual departure point and be there 30 minutes early, because vehicles leave on time more often than the old days taught travellers to expect. The train leaves from the central railway station near the riverfront. In Sihanoukville, buses arrive at company stations in the city, a short tuk-tuk ride from the ferry piers; tell the driver the pier name for your island rather than just "the port", because Koh Rong and Koh Rong Sanloem boats use the main passenger pier area and a wrong drop costs you the connection you timed everything around. Coming off a ferry on the way back, the same stations run the route in reverse all afternoon. If you are carrying dive gear, a bicycle or anything awkward, the bus companies handle it more predictably than the minivans — ask when you book, not at the kerb. And build slack into any plan that joins two bookings: an expressway trip that runs 40 minutes late is rare, but a ferry connection with zero slack turns rare into ruined.

Frequently asked questions

How long does Phnom Penh to Sihanoukville take now?

About 2½ hours of pure driving on the expressway; 3–4 hours by bus or minivan once city traffic and stops are counted; about 6½ hours by train. Budget the bus figure, not the driving figure, when timing a ferry.

What is the cheapest way?

The train, at roughly $11–12 — but it costs you half a day. The bus at roughly $13–16 is the cheapest way that still gets you to an island the same day.

Can I get to Koh Rong the same day I leave Phnom Penh?

Yes, easily — if you leave in the morning. Take an early bus or minivan, arrive in Sihanoukville by late morning, and connect to an early-afternoon ferry. The islands themselves are compared in our Koh Rong islands guide.

Durations and price ranges checked November 2026 against current operator listings and route sources. Expressway-era schedules are stable but not guaranteed — confirm your specific departure and your ferry connection when you book.