Siem Reap to Phan Rang–Thap Cham Road Trip Guide

The drive from Siem Reap to Phan Rang–Thap Cham covers roughly 750 km, crossing the Cambodian–Vietnamese border at Moc Bai and traversing the Mekong Delta before entering the coastal strip of central Vietnam. What surprises most drivers is that the route’s only major elevation gain comes just before Phan Rang, when you climb over the Ca Na pass. The border crossing itself can add 1–2 hours, so plan your start early.

Regardless of whether you take National Road 6 out of Siem Reap or detour through Kampong Cham, expect a total driving time of 15–18 hours. That’s why this route is best split over two days, with an overnight in Ho Chi Minh City or perhaps in Da Lat if you want to explore the highlands. The journey weaves through rice paddies, rubber plantations, and dramatic desert-like stretches near Phan Rang, offering one of the most varied road trips in Southeast Asia.

Road quality varies: Cambodian highways are mostly two-lane without shoulders, while Vietnamese QL1A is well-maintained but busy with motorbikes. Both countries drive on the right. Always use headlights during the day in Cambodia. Seat belts are mandatory, and child seats are recommended.

For families, the route has several kid-friendly stops: the Cambodia-Vietnam Friendship Bridge in Moc Bai, the Zoo Safari in Ho Chi Minh City (Dam Sen) is a bit off-route but worth the detour, and the water park at Ninh Chu Bay near Phan Rang. Restrooms are available at petrol stations every 50-100 km on Vietnamese highways.

Fatigue is a major risk: with long stretches of monotonous driving, take a break every 2 hours. Good rest stops include the Kompong Speu province rest stop (km 10) and the Suoi Tien rest area in Vietnam. Overnight, both Phnom Penh and Ho Chi Minh City offer abundant hotels, but consider a mid-way stop in Xuân Lộc if you prefer a quieter night.

Pet-friendly: many hotels allow pets, but always confirm in advance. In Vietnam, pets are allowed in restaurants only if on a leash; in Cambodia, they may be more relaxed.

Where to eat: try local roadside diners for authentic dishes like bánh mì in Vietnam and amok trey in Cambodia. For a sit-down meal, Phnom Penh's Riverside has numerous restaurants, and in Phan Rang, the seafood market at Ninh Chu Bay is a must.

Once you leave Siem Reap, you'll join National Road 6, which takes you straight to Phnom Penh. From there, National Road 1 heads to the Moc Bai border crossing. After entering Vietnam, continue on QL22 towards Ho Chi Minh City, then follow QL1A along the coast. From Phan Thiết, QL1A hugs the shoreline with stunning ocean views. Toll plazas on the Vietnamese side cost around 200,000–300,000 VND for the total drive to Phan Rang.

Fuel prices are lower in Cambodia (about $1.10/liter) than in Vietnam (around $0.95/liter), so fill up before crossing. A standard 40-liter tank will get you about 500 km; plan refueling at Phnom Penh, Ho Chi Minh City, and Phan Thiết. Budget roughly $60–70 for total fuel costs. Be aware that Vietnam's highways have speed cameras, and fines for speeding are steep.

• International Driving Permit required for both countries.
• Car rental with a driver in Cambodia is common; one-way drop-off to Phan Rang may cost extra.
• Consider purchasing a Vietnamese e-visa (valid for 90 days) well in advance.

The route offers dramatic shifts: the flat Tonle Sap plain of Cambodia gives way to the watery world of the Mekong Delta, with its dense canals and floating markets. Near Phan Rang, you'll encounter a stark contrast—dry, sandy fields dotted with grape vines and the deep blue of Ninh Chu Bay. This is Vietnam's driest region, with only around 700 mm of rain annually.

Along the way, you'll pass through small towns where local commerce thrives: Kampong Cham is famous for its wooden bridge over the Mekong; Phnom Penh's central market (Phsar Thmei) is a great stop for supplies. In Vietnam, Châu Đốc offers a glimpse into the floating fish farm culture of the Mekong, while Phan Rang itself is known for its Cham cultural heritage, including the Po Klong Garai temple complex.

Hidden gems: just off QL1A near Phan Rang, the Nam Cuong sand dunes offer a mini-Sahara experience, and at the Ca Na cape, you can spot wild sea turtles. how to find the best stops and hidden gems between cities can help you plan.