Ayutthaya to Koh Rong: Driving Guide & Hidden Gems

The drive from Ayutthaya to Koh Rong crosses the heart of Thailand's central plains before slicing through the eastern seaboard and ending at the ferry pier to Cambodia's tropical island.

Ayutthaya's ruined temples, a UNESCO World Heritage Site, mark the start, while the route itself passes through the Kingdom's agricultural belt, where rice paddies stretch to the horizon and sugar palm trees dot the roadside.

One geographic quirk: the entire journey stays below 300 meters above sea level until the final approach to the coast, making for a flat, fast drive.

The keyword for this trip: best stops Ayutthaya to Koh Rong.

For planning, here's a quick snapshot of the journey:

The highways are well-paved and signposted, but watch for motorbikes weaving across rural roads. In Thailand, drive on the left; in Cambodia, switch to the right – a key safety tip.

For families, the highlight is the Ayutthaya Elephant Palace & Royal Kraal, where kids can watch a short show. Another popular stop is Pattaya's Underwater World – an aquarium where children can walk through a glass tunnel.

For picnic breaks, Khao Yai National Park offers easy trails and waterfalls, perfect for stretching legs.

Pets are generally okay, but check with hotels; many Thai resorts allow small pets, while Cambodian island resorts rarely do. Keep pets on a leash at grassy rest stops.

Fatigue management: stop every 2 hours at designated rest stops (e.g., petrol stations along Highway 314). A long stretch between Prachinburi and Aranyaprathet has few facilities, so plan a lunch break in Sa Kaeo town.

Learn the how to find the best stops and hidden gems between cities before you go.

Southeast of Ayutthaya, the flat plains gradually give way to rolling foothills as you enter Chachoengsao province, famous for its bamboo charcoal industry.

In Prachinburi, Khao Yai National Park looms to the north; its forested peaks are visible from the highway on clear days, offering a stark contrast to the rice paddies.

Along the way, local markets sell fresh durian in season (June–August) and palm sugar cakes – a perfect snack.

The route aesthetics shift dramatically: monotone green fields for most of the drive, then suddenly the shoreline of the Gulf of Thailand near Chonburi, with fishing boats and salt farms.

In Koh Kong province, Cambodia, mangrove forests line the estuary, and you can spot hornbills on the ferry.

This journey is truly is it worth driving Ayutthaya to Koh Rong; the answer is yes, especially for the flexibility of stopping at hidden waterfalls like Khao Chakan.

Start in Ayutthaya on Highway 32 (Asian Highway 1), which heads south toward Bangkok, but you'll soon veer east on Highway 1 toward Nakhon Ratchasima – actually, that's north. Let's be precise: the most direct route is to take Highway 309 south out of Ayutthaya, then merge onto Highway 1 (Phahonyothin Road) heading southeast toward Bangkok. From there, you'll join Highway 304 (Chonburi–Kabin Buri) to reach the coast.

How long to drive Ayutthaya to Koh Rong depends on stops and border crossing time; plan for 7–8 hours of actual driving, plus 2–3 hours for border formalities and ferry.

Fuel up in Ayutthaya, where gas stations are frequent, but once you hit the rural stretches of Highway 33 toward Sa Kaeo, stations become sparser. Diesel is the cheapest per kilometer; expect to pay around 30 baht per liter (as of 2025).

Tolls on the Bangkok and eastern seaboard motorways can add up to 300 baht, but the scenic alternative along Highway 314 is toll-free and passes through Patthana Nikhom.

Border Crossing and Ferry

• Aranyaprathet / Poipet border is the standard route; crossing can take 1–2 hours depending on queues.
• From the border, drive about 30 km to the Koh Kong ferry pier; the ferry to Koh Rong takes 1–1.5 hours and costs 25 USD for foreigners.