Lopburi to Koh Kong: A Road Trip Guide

Lopburi to Koh Kong is a 700-kilometre drive across central Thailand to the Cambodian coast, typically taking 10–12 hours by car. The route begins at the historic Khmer temple of Phra Prang Sam Yot, a 13th-century monument famous for its resident macaques. From there, you'll follow Highway 1 (Thanon Phahonyothin) southwest through Saraburi and Nakhon Ratchasima, then connect to Highway 304 and later Highway 33 towards the border.

This guide covers essential logistics, natural and cultural highlights, and practical tips for families and pet owners. For a deeper dive into discovering off-the-beaten-path attractions, see how to find the best stops and hidden gems between cities.

Thai and Cambodian highways are generally safe if you follow speed limits (90 km/h on highways). Watch for trucks and motorbikes, especially near industrial zones. For rest, there are designated rest areas every 100 km; take a 15-minute break every 2 hours.

• Top rest stops: Saraburi (Petra Restaurant), Pak Chong (outdoor coffee shops), Chanthaburi (memorial park).
• Family-friendly: Khao Yai's visitor center, Farm Chokchai (dairy farm), and the Cambodian side's Peam Krasop Wildlife Sanctuary.
• Hidden gems: The sunflower fields at Saraburi (Nov-Jan) and the Tagoot Waterfall near Chanthaburi.

For fatigue management, plan to stop at Pong Nam Ron for a hot spring soak midway. Keep a backup driver if possible. Emergency numbers: 1193 (police) in Thailand, 119 in Cambodia.

Fuel is readily available along the entire route, with stations every 30-50 km on major highways. As of 2025, diesel costs around 30 THB/L and petrol 35 THB/L. Expect to pay around 1,500 THB in tolls, mainly on the Bangkok elevated highways. If your budget is a concern, use the toll-free inner city roads, which add an hour to your drive.

• Border crossing at Cham Yeam (Koh Kong) is open daily 7:00-20:00.
• Thai Baht accepted in Koh Kong, but USD is preferred.
• Visa on arrival costs 30 USD for most nationalities.
• Car insurance is mandatory in Cambodia; buy at the border for $15.

Road quality is excellent on Thai highways, but deteriorates near the border. The final stretch from Chanthaburi to the border includes 25 km of steep, winding roads, requiring careful driving. For the best experience, start early to avoid afternoon congestion in Bangkok.

The route passes through varied terrain: from the central plains around Lopburi, to the forested hills of Khao Yai, and finally the mangrove forests of Koh Kong province. Khao Yai National Park, a UNESCO World Heritage site, offers hiking and waterfalls. In Chanthaburi, visit the gem markets, and don't miss the cathedral, a French colonial legacy.

Local commerce thrives along the roadside: fruit stalls sell durian and mangosteen in season, and small eateries serve Isaan sausages and som tam (papaya salad). In Koh Kong, try the seafood market for fresh crab and grilled fish.

The climate is tropical monsoon. Best to drive between November and February when temperatures are cooler (25-30°C). Avoid the rainy season (June-October) as flooding can disrupt traffic.

As a family, the highway offers many kid-friendly stops: the Khao Yai night safari, the Chanthaburi aquarium, and the beaches of Koh Kong. For pets, many hotels accept them, but ensure you have a health certificate for border crossing.