The Saint-Denis to Cilaos road trip takes you from coastal roads into one of Réunion’s most dramatic mountain landscapes. After the fast RN1, the RN5 twists through ravines, tunnels, and cliffs before reaching Cilaos.
If you rent a car in Saint-Denis, you can stop along the coast and take the mountain section at a slower pace. You can also reach smaller settlements outside central Cilaos without relying on fixed transport times. Our guide covers the route, a two-day itinerary, road advice, short hikes, and the return to Saint-Denis.
The route combines fast coastal driving with a much slower mountain section. Your plans should account for weather, traffic, fuel, sightseeing, and changing road conditions.
When driving from Saint-Denis to Cilaos, follow the RN1 towards Saint-Paul and continue towards Saint-Louis. From there, the RN5 turns inland and climbs into the cirque. It is the main road into Cilaos.
The full distance is roughly 110 to 120 kilometres, depending on your starting point and route. A realistic driving time from Saint-Denis to Cilaos is around 2 hours and 30 minutes. Add extra time for traffic, slow vehicles, and sightseeing stops. The coastal part is mostly faster motorway driving, but the final section is very different. The RN5 climbs through bends, ravines, and tunnels. Your speed drops quickly, so patience matters more than a navigation app’s fastest estimate.
The RN5 is often called the Route des 400 Virages, or Road of 400 Bends. You pass steep cliffs, hairpins, deep valleys, and three tunnels before reaching Cilaos.
Drive at a speed that lets you stop safely within the road you can see. Use the horn briefly before very narrow blind bends when needed. Keep to your side and give larger vehicles enough space. Wait if another vehicle has already entered a narrow tunnel. Never stop on the road for a photo. Use designated pull-offs or parking areas to enjoy the mountain views safely.
You do not need a large SUV just because you are driving into the mountains, and a compact or economy car is easier to drive through narrow sections. An automatic car can also reduce your workload during repeated climbs and bends.
Check your fuel before leaving Saint-Louis and top up if needed. In Cilaos, parking is available near several visitor areas, including central village parking and Roche Merveilleuse. A morning road and weather check is also important before you enter the RN5.
Book a car rental in Saint-Denis with Final Rentals before your mountain trip. Your booking includes unlimited mileage, Collision Damage Waiver, and Third-Party Liability cover. You can also ask about the optional Super Collision Damage Waiver at the rental desk.
Leave Saint-Denis in the morning rather than midday to have more daylight for the RN5 and more time in Cilaos before evening. The RN1 can be quick drive in lighter traffic, but delays can change your plans. Mountain clouds can also build later in the day, especially around higher ground.
Réunion is warmer and wetter from November to April. May to October is usually cooler and drier. Tropical weather can still affect the island, so delay the drive during severe weather conditions.
Your first day takes you from the northern coast to the western side before turning inland. Keep the schedule light and flexible because the final mountain drive is part of the experience.
After you pick up your car, join the RN1 towards Saint-Paul and Saint-Louis. The route uses the main western coastal corridor and the Route des Tamarins. For a short stop, the Saint-Paul seafront works well without taking over your morning. You can walk near the bay before continuing south.
A local market also runs nearby on Friday and Saturday mornings. Before Saint-Louis, check your fuel and set your navigation. Take a comfort break if needed. Once the road starts climbing, your attention should stay on the road ahead.
From Saint-Louis, follow signs for Cilaos and the RN5. The road soon narrows and begins climbing through the gorge. Expect about 1 hour and 30 minutes for this mountain section.
You will meet frequent hairpins and tunnels, with short straights between them. Wait when another vehicle is already using a narrow tunnel. Use the horn briefly before restricted blind sections when needed. Only stop at safe pull-offs or parking areas. Do not pause on bends for photographs. If a faster driver comes up behind you, let them pass only when the road is clearly safe.
Once you arrive, park and explore central Cilaos on foot. The village is known for lentils, wine, and embroidery, as well as Creole cuisine and local crafts. For lunch, try a Creole dish using Cilaos lentils. You may also find dishes made with local wine. Eating in the village connects your trip with the cirque’s farming traditions.
Keep your afternoon walk gentle after the long drive. You can visit Mare à Joncs or drive to Roche Merveilleuse. The viewpoint has nearby parking and views across Cilaos and the surrounding mountain walls. The full Roche Merveilleuse loop is about 7 kilometres and takes around 3 hours. Save it for another day if you want a relaxed first afternoon.
Staying overnight is what makes this itinerary feel relaxed. You avoid driving the RN5 twice on the same day. You also get more time for dinner and mountain views.
Cilaos also has a thermal centre with baths, steam facilities, and massage treatments. Check the current opening times and book in advance if you want to include a visit. Choose a hotel, guesthouse, or mountain gîte with convenient parking. Before bed, check the next morning’s weather and trail status.
Use the cooler morning for outdoor activities, then keep enough time for lunch and the return drive. Let weather and road conditions guide your final schedule.
Start early because clouds often build over higher ground as the day warms. Morning conditions may give you clearer views across the cirque. The Sentier des Sources near Bras Sec is a practical short walk. The loop is about 2 kilometres and takes roughly 1 hour and 30 minutes. It includes around 117 metres of ascent and passes through the forest.
For a longer option, Cascade du Bras Rouge is about 6 kilometres and takes around 3 hours. The route has about 399 metres of ascent. Wet or polished rock can be slippery, so check conditions before you go. Wear suitable shoes and carry water and a light rain layer. Always check current trail conditions before starting a hike.
Your rental car is useful for exploring beyond central Cilaos. You can drive towards Bras Sec, Palmiste Rouge, or Îlet à Cordes. Îlet à Cordes is an interesting extension. The RD241 leaves central Cilaos and crosses a quieter part of the cirque.
The area is closely linked with local lentil farming. Treat these drives as optional. Roads can remain narrow and winding outside the village. Turn back if visibility worsens or your return schedule starts feeling rushed.
Return to the village around lunchtime for one last relaxed stop. Buy local lentils, wine, spices, or crafts before leaving. You can also visit the Maison de la Broderie if its opening times match your trip. It displays and sells traditional Cilaos embroidery linked with the village’s long craft history. Before entering the RN5, check your fuel, road conditions, and rental return time.
Retrace the RN5 towards Saint-Louis. The descent still requires steady speed and attention because you face the same bends, tunnels, and limited sightlines.
Slow before entering bends instead of braking sharply while turning. On longer descents, use a lower gear to help control speed. Increase your distance from the car ahead when the road is wet. Once you reach Saint-Louis, return to the faster RN1 corridor. Check traffic before setting your final arrival time. Refuel before returning the car if your rental agreement requires the same fuel level.
The best reason to make Saint-Denis to Cilaos a two-day trip is to explore more of Cilaos. Staying overnight gives you time to explore the village, take a short hike, and enjoy better morning views before driving back. You also have more freedom to adjust your plans if the cloud or rain affects the mountains.
Rent a car in Réunion with Final Rentals to keep your coastal and mountain days on your own schedule. You can choose from several car types, while the optional Super Collision Damage Waiver can reduce your excess to zero. Book and manage your car rental anytime. Download the Final Rentals app on Google Play and the App Store.
Plan around 2 to 2 hours and 30 minutes of driving before sightseeing stops. Traffic and slower mountain vehicles can increase the journey time. The RN5 section between Saint-Louis and Cilaos often takes about 1 hour and 30 minutes. Its tight bends and narrow sections make the final part much slower than the coastal drive.
The route is suitable for normal cars, but the RN5 needs careful driving. You will face tight bends, narrow tunnels, steep mountain scenery, and limited sight lines. Drive slowly and keep to your side. Let vehicles already inside narrow tunnels pass first. If you are new to mountain roads, take your time and avoid following faster local drivers.
Yes. Two days give you enough time for the mountain drive, central Cilaos, a short hike, and an overnight stay. You can explore at a calmer pace before returning to Saint-Denis. It is more comfortable than fitting both the RN5 drives and all your sightseeing into one day. Traffic, cloud, or road conditions can affect your plans.
