Siem Reap to Uthai Thani: Road Trip Guide

The drive from Siem Reap to Uthai Thani crosses a border and traverses the flat expanse of the Cambodian lowlands before climbing into Thailand's central plains. This route, roughly 400 kilometers, offers a mix of ancient temple grounds and modern highways.

Despite the short distance, the journey requires a border crossing at Poipet and Aranyaprathet, which can add an hour or two of paperwork.

Road quality varies: in Cambodia, expect potholes and uneven surfaces, especially between Siem Reap and Sisophon. Thailand's highways are well-maintained, but be cautious of motorcycles and agricultural vehicles.

For families, rest areas are plentiful on Thai highways, with clean restrooms and playgrounds. A notable stop in Thailand is the Prachinburi rest area, 60 km after the border, which has a large food court and green lawns.

Fatigue is a factor on the long straight roads. Plan to stop every 2 hours; there are designated rest zones every 50-100 km in both countries.

Pet-friendly pit stops are scarce, especially in Cambodia; pack water and a bowl. In Thailand, some petrol stations like PTT allow pets to stretch on their grass areas.

Hidden gem: the Pha Nam Yoi Forest Park near Uthai Thani, a small wetland with a viewing tower, is perfect for a short break.

In Cambodia, National Highway 6 runs straight from Siem Reap to Poipet. After crossing into Thailand at Aranyaprathet, take Route 33, then Route 1, and finally Route 340 to Uthai Thani. The roads are mostly two-lane in Cambodia, expanding to divided highways in Thailand.

• Fuel: Gas stations are frequent in Cambodia (every 30-50 km) and abundant in Thailand.
• Costs: As of early 2025, Cambodia fuel prices are around $1.20 per liter, Thailand around $0.95.
• Tolls: Only on Thai motorways, with a total of about 200 baht ($6) for the entire stretch.

Border procedures require a vehicle permit for foreign-registered cars, which takes about an hour. Make sure to have your passport, vehicle registration, and an International Driving Permit.

For trip planning, see how to find the best stops and hidden gems between cities.

Just outside Siem Reap, the road skirts the Kulen Promtep Wildlife Sanctuary, a dry forest habitat for endangered species like the sun bear. In Thailand, the landscape changes to rice paddies and sugar palm groves near Uthai Thani.

Local commerce varies: roadside stalls in Cambodia sell fried spiders and palm wine, while Thai markets offer mangoes and sticky rice.

A highlight is the UNESCO World Heritage Site of Sambor Prei Kuk, 60 km east of Siem Reap, a pre-Angkorian temple complex that's a worthwhile detour. The ruins date back to the 7th century and are less crowded than Angkor Wat.

In Thailand, near the border, you'll find the Khmer temple of Prasat Ta Muen Thom, dating from the 11th century, which is also a UNESCO tentative site.