Sihanoukville is Cambodia\’s main coastal city and the departure point for ferries to Koh Rong and Koh Rong Samloem. The city itself has changed dramatically over the past decade with heavy Chinese investment — it\’s noisier and more developed than it once was — but the nearby islands remain excellent. Getting there from Phnom Penh is easy: the expressway has cut the journey to under 4 hours by bus.
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ℹ️ Most travellers only pass through Sihanoukville en route to the islands. If you\’re heading to Koh Rong or Koh Rong Samloem, coordinate your bus arrival time with the ferry schedule to avoid an overnight stop in the city.
Option 1: Express Bus
The express bus is the go-to option for this route. Phnom Penh to Sihanoukville takes around 3.5–4.5 hours on the expressway. Giant Ibis, Mekong Express, and several other operators run comfortable, air-conditioned services with multiple daily departures.
- Operators: Giant Ibis, Mekong Express, Larryta, Capitol Tours
- Journey time: 3.5–4.5 hours
- Price: $7–12 USD
- Departures: Multiple daily from 6:30 AM
- Pick-up: Hotel pick-up available from central Phnom Penh with major operators
If you\’re heading to the islands, take an early morning departure (7:00–8:00 AM) to arrive in Sihanoukville in time for the afternoon ferry to Koh Rong.
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Option 2: Shared Taxi
Shared taxis depart from Phnom Penh\’s taxi stand near the Central Market (Phsar Thmei). They\’re slightly faster than the bus but significantly less comfortable — four or five passengers packed into a saloon car. The price is similar to the bus.
- Journey time: 3–4 hours
- Price: $8–12 USD per seat (or $30–40 to charter the whole vehicle)
- Note: Departure is when the taxi is full — no fixed schedule
Option 3: Minivan
Shared minivans operate on this route and are a common choice for budget travellers. Cramped but functional — not recommended for anyone over 5\’10\” or prone to car sickness on winding roads.
- Journey time: 3.5–5 hours
- Price: $6–9 USD
Option 4: Flight
Sihanoukville has a small international airport (KOS), though domestic flight options from Phnom Penh are limited. With the expressway making the bus journey under 4 hours, flights are rarely practical or cost-effective for this short a route.
- Journey time: ~40 minutes flying
- Price: $50–100 USD
- Practicality: Low — the bus is faster door-to-door when accounting for airport time
Journey Summary
| Method | Time | Cost from | Best for |
|---|---|---|---|
| Express bus | 3.5–4.5 hours | $7 USD | Most travellers |
| Shared taxi | 3–4 hours | $8 USD | Slightly faster |
| Minivan | 3.5–5 hours | $6 USD | Budget only |
| Flight | ~40 min | $50 USD | Rarely practical |
Sihanoukville: Transit Tips
Most travellers use Sihanoukville only as a transit point for the islands. The Tourist Pier (Ochheuteal Pier) is where ferries to Koh Rong and Koh Rong Samloem depart. It\’s about 10–15 minutes by tuk-tuk from the bus station. If you arrive too late for the last ferry, budget guesthouses near the pier are available for an overnight stop.
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Frequently Asked Questions
How long is the bus from Phnom Penh to Sihanoukville?
Around 3.5–4.5 hours on the expressway with a reliable operator like Giant Ibis or Mekong Express.
Is Sihanoukville worth visiting?
The city itself is mainly a transit hub these days. Most travellers pass through on their way to Koh Rong or Koh Rong Samloem. Otres Beach to the south of town has a more relaxed atmosphere if you need to stay a night.
Can I get from Phnom Penh to Koh Rong in one day?
Yes. Take an early morning bus (7:00–8:00 AM departure) and you\’ll be in Sihanoukville by midday, in time for afternoon ferries to Koh Rong. The last ferry is usually around 3:00–4:00 PM.
Related Guides
- Sihanoukville to Koh Rong: Ferry Guide
- Phnom Penh to Koh Rong: Combined Bus + Ferry
- Koh Rong vs Koh Rong Samloem: Which Island to Choose
- Phnom Penh to Siem Reap: All Options Explained
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