Phong Nha Cave Tours Compared: Son Doong, Hang En, Tu Lan, Paradise and Dark Cave in 2026

In 2026, cave access in Phong Nha-Ke Bang National Park is divided into two channels. Oxalis Adventure is the only licensed operator for Son Doong, Hang En, and Tu Lan expedition tours. No other company can sell those three trips, regardless of what a website claims. Paradise Cave and Dark Cave are managed separately as self-guided or shorter excursions, so visitors buy entry tickets or combo packages directly at those sites without going through Oxalis permits. Paradise Cave entry costs 250,000 VND and the Dark Cave combo 450,000 VND, and neither includes Oxalis expedition permits.

For the Oxalis expeditions, permits are included in the tour price, but travelers must bring a passport and complete a medical form before departure. The passport confirms identity for the national park permit, and the medical form records basic health and fitness information that Oxalis uses to assess whether you can handle the route. This applies to all expedition guests, including shorter Tu Lan day tours. All expedition groups are small and include e-bikes, safety gear, and meals, so the permit covers the full package rather than just cave entry.

Exact 2026 schedules can change at short notice. From September to November, torrential rains often close expedition caves, and flood-related cancellations are common. Check Oxalis Adventure and the official Phong Nha park website before booking, and avoid old blog rates from 2023 or 2024. For Son Doong and Hang En, book 3-6 months ahead to secure a dry-season slot.

Before paying, confirm your permit status directly with Oxalis Adventure. Their website lists departure dates and permit requirements for Son Doong, Hang En, and Tu Lan. The official Phong Nha park website also posts closure notices when floods suspend cave access. Since exact 2026 schedules can change, do not treat a booking confirmation as a final permit guarantee until you receive the operator's pre-departure confirmation.

Son Doong: the four-day expedition

The US$3,000 price for Son Doong buys a 4 days, 3 nights guided expedition inside Phong Nha-Ke Bang National Park, with permits, meals, e-bike transfers, and safety gear all included. Oxalis Adventure remains the only licensed operator for Son Doong in 2026, and each departure is a small group, so capacity is strictly limited. You must bring a passport and complete a medical form before the tour starts.

The route is demanding: expect river crossings, steep climbs, and slippery rock inside the cave. Moderate fitness is the minimum, and proper cable footwear is required for those sections. Guide instructions are mandatory for safety; the crew sets fixed scrambling lines and campsites, and you must follow their directions at all times.

Because Oxalis Adventure is the only licensed operator and departures are small-group, dry-season places sell out early. Book 3-6 months ahead for a February to August slot, the best season for Son Doong. Dry-season dates fill quickly because cave conditions are most stable then. Do not expect to walk into Phong Nha and join a Son Doong group the same week; advance planning is part of the permit process. Confirm the current 2026 price on the Oxalis official site, as prices may rise.

From September to November torrential rains can close Son Doong at short notice, and no departure date is guaranteed. The park suspends expeditions when river levels inside the cave rise, and even a booked February to August trip can be postponed if a late storm hits. Oxalis will reschedule or refund according to its weather policy, but flexible flights to Dong Hoi are essential. Check current 2026 schedules and flood-related cancellations on the official Oxalis and Phong Nha-Ke Bang National Park sites before booking.

Hang En is a 2 days, 1 night expedition priced at roughly US$600 per person, and that price includes permits, e-bikes, safety gear, and meals. Oxalis Adventure remains the only licensed operator for Hang En, so you cannot book this trip through any other Phong Nha company. Son Doong costs US$3,000 and runs 4 days, 3 nights, which makes Hang En the shorter and cheaper overnight option.

The fitness bar is not lower because the trip is shorter. Hang En still requires moderate fitness and proper cable footwear, and you follow guide instructions at all times. It is not a walk-up cave. The expedition is a guided overnight trek with small groups, and the same licensed operator enforces the same safety rules for Hang En and Son Doong.

Book Hang En 3-6 months ahead for February to August departures. That dry-season window offers the most reliable cave access. September to November brings torrential rain and frequent short-notice closures that affect Hang En as well as Son Doong. If you need a specific date, check the official Oxalis site for available slots, because Hang En places for dry-season dates go quickly. The 4 days, 3 nights Son Doong expedition requires the same advance planning, so Hang En is the practical choice if you have less than a week in Phong Nha.

Tu Lan day tours, priced from US$100 to US$400, give you a shorter entry point into the same licensed expedition system without an overnight stay. For visitors who want independent cave visits, Paradise Cave entry is 250,000 VND and the Dark Cave combo is 450,000 VND, managed separately from Oxalis expeditions. Bring your passport and complete the required medical form for any Hang En or Tu Lan departure, and confirm 2026 prices on the official Phong Nha park sites because they may rise.

Tu Lan day tours in Phong Nha run from US$100 to US$400 per person for 2026, and the permit is already bundled into the tour price. That range covers different one-day options, from shorter valley walks to longer cave circuits, and the final rate depends on which route you pick. Oxalis Adventure is the only licensed operator for these Tu Lan trips, so you book directly through them rather than through local agents.

A Tu Lan day tour includes an e-bike transfer, safety gear, and meals, but you carry less overnight equipment than on Son Doong (4 days, 3 nights) or Hang En (2 days, 1 night). The physical level is moderate, not a casual stroll: you need to be comfortable walking on wet, uneven rock and climbing short sections. Bring proper cable footwear, not sandals or smooth-soled trainers. Guides run small groups and stop to adjust pace, but you are still on your feet for several hours.

February to August is the best season for Tu Lan day tours. From September to November, torrential rain in Phong Nha can close or alter Tu Lan routes at short notice, sometimes forcing operators to swap caves or cancel sections of the itinerary. If you are flying in specifically for this, check the weather in the days before and have a backup date. Oxalis will contact booked travellers if a route changes, but refunds depend on how late the cancellation happens.

Treat the US$100 to US$400 range as a 2026 estimate, not a fixed menu: prices may rise and the older 2023-2024 blog rates you see online are often inaccurate. Confirm the current 2026 rate on the Oxalis Adventure website before you commit. Unlike Son Doong and Hang En, where you should book 3-6 months ahead, a Tu Lan day tour usually has more same week availability outside peak months, but booking a few weeks ahead for February to August is safer.

Paradise Cave and Dark Cave: self-guided options

Paradise Cave entry costs around 250,000 VND and is managed separately from Oxalis expeditions. Dark Cave's combo entry is about 450,000 VND, also outside the expedition permit system. These two caves are the easiest Phong Nha cave tours for independent travelers because neither requires a multi-day guide or an overnight stay. You buy a ticket at the site and walk in without joining an expedition group, and you do not need to book weeks ahead. Oxalis expedition prices include the park permit, but you must bring a passport and complete a medical form before departure. Paradise Cave and Dark Cave have no expedition permit step, so entry is simpler.

The price gap with Oxalis is wide. Son Doong costs about US$3,000 for 4 days and 3 nights. Hang En costs roughly US$600 for 2 days and 1 night. Tu Lan day tours run from US$100 to US$400. Those expedition prices include e-bikes, safety gear, and meals. The Paradise Cave and Dark Cave entry fees cover only admission and basic site access, not transport, food, or caving equipment. If you want a short walk through a show cave, this is the cheaper route, but bring your own water and snacks. Entry prices may rise in 2026, so confirm on the official Phong Nha park website before you visit.

Season matters for both trip styles. The best time for Phong Nha weather runs from February to August. From September to November, heavy rain can force short notice closures, including at expedition caves. Book Son Doong and Hang En 3-6 months ahead for dry-season slots, but you can usually buy Paradise and Dark Cave tickets on the day. Independent caves can also close if flooding begins, so check opening hours and any same-day closure on the official Phong Nha park website before you drive out. Hours and prices change, confirm on official websites.

Phong Nha weather: best season and cancellations

Phong Nha cave tours run most reliably from February to August, the dry window that keeps river crossings and campsites accessible in Phong Nha-Ke Bang National Park. February and March are transitional months with occasional showers, while April through August bring the most stable conditions for multiday expeditions. If you want a Son Doong or Hang En departure in this period, book 3-6 months ahead because dry-season slots sell out that far in advance.

From September to November, torrential rains in Phong Nha often close expedition caves at short notice. Son Doong and Hang En are the most affected because their routes depend on river levels and overnight camps along waterways. Tu Lan tours and the independent caves can also face route changes: Paradise Cave and Dark Cave sometimes remain open, but entrance paths and underground river sections may be adjusted or suspended when water rises. A confirmed rainy-season booking does not guarantee departure; operators cancel for safety rather than run in flood conditions.

For February to August dates, early booking is required for Son Doong and Hang En. Son Doong (4 days, 3 nights, US$3,000) and Hang En (2 days, 1 night, US$600) fill their limited permits months ahead, so buyers need to commit 3-6 months ahead. Tu Lan day tours from US$100 to US$400 have more flexibility but still tighten around peak dry-season weeks. Independent caves are easier: Paradise Cave entry is 250,000 VND, and the Dark Cave combo is 450,000 VND, and both sell tickets on site or through Phong Nha park offices.

Do not rely on old blog rates from 2023 or 2024 to forecast 2026 availability or cancellations. Confirm flood-related closures with Oxalis Adventure, the licensed operator for Son Doong, Hang En, and Tu Lan, and check official Phong Nha-Ke Bang National Park notices before traveling. Hours and prices change, so treat the February to August window as the planning baseline, not a guarantee against short-notice weather disruptions.

For 2026, secure Son Doong and Hang En slots 3-6 months ahead if you want a February to August departure. Son Doong runs 4 days, 3 nights at about US$3,000. Hang En runs 2 days, 1 night at roughly US$600. Tu Lan day tours cost US$100 to US$400. Oxalis Adventure is the only licensed operator for these three tours, and permits are included in the price. Dry-season slots are released in blocks, and the 3-6 month lead time gives you access to the widest choice of dates.

Bring your passport and complete the medical form required for Son Doong, Hang En, and Tu Lan. Cable footwear is mandatory, and you must follow guide instructions at all times. Moderate fitness is required for Son Doong and Hang En, where river crossings and uneven cave floors are common. All expeditions run in small groups and include e-bikes, safety gear, and meals, so you only need to sort your own clothes and shoes.

Paradise Cave and Dark Cave are the independent option. You can walk up and pay at the ticket counter without joining a guided group. As of 2026, Paradise Cave entry costs 250,000 VND and the Dark Cave combo costs 450,000 VND. Check the official Phong Nha park website before you go because these entrance rates may rise without notice.

Only use Oxalis Adventure and official Phong Nha park websites for current 2026 prices, permit rules, and schedules. Avoid 2023-2024 blog rates, which miss recent increases and permit changes. The best season runs February to August; from September to November torrential rains often close expedition caves at short notice, so confirm your departure with the operator before traveling to Phong Nha.