Phong Nha travel guide: which caves to choose, how long, how to get there

Decide your effort level before you book anything

The park's caves fall into three groups, and mixing them up is the most common planning mistake. The show caves — Phong Nha Cave, Tien Son Cave and Paradise Cave — are open daily with tickets at the gate, have lit paths or boats, and suit families and anyone in ordinary shoes. The day adventures — the Chay River and Dark Cave (Hang Toi) site, the 4.5-kilometre Phong Nha Cave trip, the 7-kilometre Paradise Cave trek and Oxalis's Tu Lan and Hang Tien day trips — need you to get wet, muddy or both. The expeditions — Hang En, Hang Va and Nuoc Nut, the multi-day Tu Lan routes and Son Doong — are guided treks with camping, limited places and a season.

The national tourism site notes that the authorities restrict access to the larger caves for conservation, and that certain companies hold exclusive rights to take visitors into particular caves. The park's own pages list Oxalis Adventure as the operator for Son Doong, Hang En and Hang Va. In practice that means the big names are booked with one company, often well ahead, while the show caves can be fitted in on the day.

If you have two days, do one show cave each morning and keep the afternoons for the countryside. If you have three or more, add one adventure day. Plan an expedition first and build the rest of the trip around its fixed departure date.

Phong Nha Cave and Tien Son: the boat trip on the Son River

Phong Nha Cave is the park's original attraction, and the visit starts on the water. From the tourism centre in Phong Nha town, boats travel about 30 minutes along the Son River to the cave mouth, where the engine is cut and the boat is paddled along roughly 1,200 metres of the underground river. On the way back you walk the dry chambers known as Hang Tien and Hang Cung Dinh on composite walkways. The park's page puts the whole visit at about two and a half hours. The river runs blue-green in the dry season and turns red-brown in the rains.

When we checked on 2026-10-03, the national park's site listed Phong Nha Cave at 150,000 VND per person, plus a boat at 700,000 VND per boat for the return trip with up to 12 passengers, or 750,000 VND if the boat also waits for Tien Son Cave. Tien Son, a dry cave about 100 metres higher up the mountain, was listed at 80,000 VND and is reached by nearly 600 steps from the landing. The same pages listed daily opening from 7:15 to 16:30 in summer and 7:30 to 15:45 in winter, and English-speaking guides at 400,000 VND for one cave or 500,000 VND for both.

The boat price is per boat, not per person, so it costs much less shared. Ask at your guesthouse whether other travellers are going the same morning. If you want more than the standard visit, the park also runs a 4.5-kilometre Phong Nha Cave trip by kayak and on foot, with a swim in an underground lake; when we checked it was listed at 1,700,000 VND per person, for groups of three to 20, and children only from the age of ten.

Paradise Cave and the wet-and-muddy day out

Paradise Cave (Thien Duong) is a dry cave of extraordinary scale: the park's page gives a length of 31.4 kilometres and chambers up to 150 metres wide. Visitors see the first kilometre on a wooden staircase walkway, after a 1.6-kilometre ride by electric buggy or a walk under the forest and a 500-metre climb to the entrance. When we checked on 2026-10-03, the park listed adult tickets at 270,000 VND including the buggy, 145,000 VND for children between 1.1 and 1.3 metres tall and free entry below 1.1 metres. It lies at Km 16 on the western branch of the Ho Chi Minh Road, so you need a car, motorbike or tour to get there. A guided 7-kilometre trek deeper into the cave, with a short kayak crossing, was listed at 2,000,000 VND per person for a day, with a minimum of two people.

The Chay River and Dark Cave site is the opposite: few formations, lots of activity. The park describes a 400-metre zipline across the river to the cave entrance, a mud bath inside the cave, then kayaking, swimming and water games on the river. When we checked, the full package with the cave and mud bath was listed at 450,000 VND for adults, with cheaper packages that leave out the cave. The listed hours were 7:45 to 16:30 in summer and 8:00 to 15:30 in winter; the mud bath needs a height of at least 1.1 metres and the long zipline a weight above 40 kilograms. Bring swimwear, a towel and a change of clothes, and leave valuables behind.

Nuoc Mooc, about 20 minutes by car from Phong Nha Cave, is the gentle option: a spring-fed stream in the forest where the park says the water stays at around 16–18°C even in summer. A sightseeing-only ticket was listed at 80,000 VND, with packages that add kayaks and swimming areas. It makes an easy afternoon after a morning in one of the caves.

Expeditions: Hang En, Hang Va, Tu Lan and Son Doong

These are guided treks, not cave visits, and they come with fitness, age and season rules. The park's pages describe them as follows; check the operator's current conditions before you plan around them.

Oxalis's own FAQ says you need basic swimming skills for any Tu Lan, Hang Va or Hang Ba tour, but not for Hang En, the one-day Hang Tien trek or Son Doong. Life jackets are compulsory, and when the temperature drops below 18°C in winter, guides use boats or rafts instead of swimming. The cave floor on all of them is uneven, with boulders and climbs. Tu Lan tours start from the operator's base in Tan Hoa village, which its day-tour page puts 70 kilometres from Phong Nha, so expect an early pick-up.

• Hang En (2 days, 1 night): a 25-kilometre trek across the Rao Thuong stream and through the Bru-Van Kieu village of Ban Doong, with a night camped on a sandy beach inside the cave. Oxalis rates it 3 out of 6, runs it from December to mid-September for up to 16 people aged 16 to 70, and the park listed it at 8,800,000 VND per person when we checked.
• Hang Va and Nuoc Nut (2 days, 1 night): about 15 kilometres of jungle trekking, rope work and wading to rare cone-shaped stalagmites in calcite pools; January to August only, up to 10 people aged 16 to 70, listed at 9,200,000 VND.
• Tu Lan cave system (1 to 5 days): swimming through river caves, crawling through dry ones and camping by rock pools; there are one-day and family versions, and the national tourism site notes that parts of Kong: Skull Island were filmed in the area.
• Son Doong (6 days, 5 nights): four days of trekking and nights camped inside the world's largest cave, including a supported climb up the 90-metre wall known as the Great Wall of Vietnam. The park says it runs from January to August, in groups of up to 10, with places limited to 1,000 guests a year; the listed price was 79,500,000 VND per person.

Bong Lai, the river and the slow side of Phong Nha

Leave at least one afternoon for the countryside. The national tourism site recommends cycling the 15-kilometre Bong Lai Valley loop off the Ho Chi Minh Road, past farms, viewpoints and swimming holes, and many hotels lend bicycles for rides around town. The best routes ford rivers and streams, so wear shoes that can get wet. A motorbike with a driver is the easier option if you are not used to Vietnamese roads.

The Son River itself is worth an hour. The tourism site mentions kayak rentals for independent trips on the river near town, and kayak tours as a quieter way to approach Phong Nha Cave. For the forest rather than the caves, it points to guided hikes, night walks for wildlife and visits to the park's animal rescue work; the national park also lists a botanical garden among its eco-tourism sites.

History is never far away. The park's tourism pages list the Road 20 Quyet Thang memorial, including the Tam Co cave, and the Commander Cave on the Truong Son (Ho Chi Minh) Trail among their sites, reminders that these roads were part of the wartime supply route. Pair them with a visit to the DMZ further south in Quang Tri.

Getting there: Dong Hoi by train or plane, or the night bus

Dong Hoi is the gateway. It is a stop on the main Hanoi–Ho Chi Minh City railway, with Hue and Da Nang to the south and Ninh Binh to the north, and has domestic flights from Hanoi and Ho Chi Minh City. Oxalis's arrival guide puts the Hanoi–Dong Hoi flight at about 1 hour 5 minutes and says Phong Nha is about 45 kilometres west of Dong Hoi. From the airport or station, the national tourism site calls a metered taxi the easiest transfer; local buses also run between Dong Hoi and Phong Nha, but their terminals are a few kilometres from the station and airport.

The overnight train lets you arrive without losing a day. Oxalis advises against arriving by train on the morning of a one-day tour, because train times cannot be guaranteed: arrive the evening before. Check times and book on the Vietnam Railways website (dsvn.vn), and see our Vietnam trains guide for the wider network.

By road, Oxalis says most bus companies now stop in Phong Nha itself, which saves the change in Dong Hoi, and that night buses leave Hanoi in the early evening. The national tourism site also mentions daily buses to Phong Nha from Hue and Da Nang. Bus companies, times and fares change; book through your hotel or the company the day before and confirm where it stops.