Hang En vs Tu Lan: which overnight cave trek should you book?

The short answer

Hang En is the cathedral. Tu Lan is the swim. Both are moderate, multi-day, guided trips run by Oxalis at broadly similar prices, and both are excellent. The choice is about what kind of memory you want.

Book Hang En if the thing pulling you to Phong Nha is scale: sleeping on a sand beach inside the world's third largest cave and waking to thousands of swifts pouring out of the entrance at sunrise. Book Tu Lan if you would rather be moving through water: a system of river caves you swim into, with jungle trekking and camping between them, in the landscape used for Kong: Skull Island.

Hang En: what you are paying for

Hang En is a two-day, one-night trip. You trek in through the jungle and a minority ethnic village, enter the cave, and camp on a beach beside an underground river with the entrance arch framing the sky above you. The famous moment is the morning: the swifts that give the cave its name leave in a stream at first light.

It is also, quietly, the first night of the Son Doong expedition. Son Doong groups hike the same approach and sleep on the same beach before continuing. Booking Hang En on its own buys you the opening chapter of the most famous cave trip in the world for a fraction of the price, which is why it is the overnight most people pick.

Tu Lan: what you are paying for

Tu Lan is a whole cave system rather than a single cave, run out of Tan Hoa about 70km from Phong Nha town. Trips run anywhere from one to five days, so it flexes to the time you have. The signature of it is water: you swim into cave mouths with a headlamp, float through passages, come out into jungle, and do it again.

It is the more physical of the two in a specific way. Hang En asks you to walk a long way with a pack. Tu Lan asks you to swim repeatedly, scramble over wet rock and be comfortable in water you cannot see the bottom of. Neither needs technical skill, but they tire you out differently.

What the camps are like

Hang En camp is the reason people book Hang En. Tents are pitched on a sand beach inside the cave, beside an underground river, with the huge entrance arch open to the sky above you. There is no light pollution and no sound except water and birds. Dinner is cooked in the cave and eaten at a long table, and the group is usually somewhere between 10 and 20 people with a large support team.

Tu Lan camps are outside, in the jungle, beside rivers rather than inside the caves themselves. You swim through the caves during the day and sleep under the trees at night, often near a swimming hole you can jump into before breakfast. It is a more conventional camping experience in a spectacular setting, where Hang En is an unconventional one.

Both feed you well, and both provide the tent, the sleeping mat and the porters who carry the heavy things. Neither is roughing it in the sense that word usually implies.

Fitness: what you actually need

For Hang En, you need to be able to walk about 10km in humid heat over uneven ground, including a jungle descent and river crossings, carrying a daypack. If you can manage a long hilly day walk at home without dreading the next morning, you can do Hang En.

For Tu Lan, you need that plus the ability to swim confidently in cold water while wearing a life jacket and a helmet, repeatedly, sometimes in the dark. You do not need to be a strong swimmer in the competitive sense, but you do need to be untroubled by putting your face near water you cannot see through. People who quietly dislike swimming have a much worse time on Tu Lan than they expect.

Neither requires caving experience, rope skills or any technical training. Both are guided at a ratio that means someone is always near you.

Price and length

Hang En is around $333 (8,800,000 VND) for the two-day, one-night trip. The Tu Lan Encounter, the most commonly booked Tu Lan option, is around $292 (7,700,000 VND), with longer four and five-day Tu Lan expeditions costing considerably more. Prices checked June 2026.

Both are booked directly through Oxalis, which holds the licence for both caves. There is no price comparison to do between operators, because there is only one operator. What you are comparing is the trips.

What is included, and what is not

Both trips include the guides, the safety team, porters, all meals during the trip, camping equipment, helmets, headlamps and life jackets, and the park permits. That is why the price looks high next to a self-guided cave ticket: you are paying for a supported expedition rather than an entrance fee.

What is generally not included: transport from your accommodation to the trailhead on some departures, personal gear like boots you are happy to soak, travel insurance that actually covers adventure activity, and tips for the porter team, which is customary and appreciated. Check the specific inclusions when you book, because they vary between the shorter and longer Tu Lan options in particular.

Season

Hang En runs roughly December to mid-September. Tu Lan runs roughly December to August. The overlap is wide, so for most trips both are available and season will not decide it for you. If you are travelling at the very end of the dry window, in late August or early September, check Hang En first, as it stays open marginally later.

In both cases the caves close when water levels make them unsafe rather than on a fixed calendar, so dates move year to year.

Booking and how far ahead

Both are booked directly through Oxalis, which holds the licence for Hang En and for the Tu Lan system. There is no agent who can get you a better price and no second operator to compare against, so the only real decision is dates.

In practice Hang En needs more lead time than Tu Lan, because it has fewer departures and a much higher profile. A few weeks ahead is usually enough outside the busiest months; over Tet and through the European summer, think in months. Tu Lan runs more frequently and in more variants, so it is the more likely of the two to have space at short notice, which is worth knowing if you are already in Vietnam and deciding as you go.

Which to pick

Pick Hang En if this is your one big cave trip, if you want the photograph everyone recognises, if you are travelling with someone who is a strong walker but a nervous swimmer, or if there is any chance you will do Son Doong one day and want to see how the story starts.

Pick Tu Lan if you are a confident swimmer, if you want more days in the field, if you have already done a big dry cave and want something different, or if the Kong: Skull Island landscape is part of the draw. It also suits people who prefer moving all day to arriving somewhere and sitting in awe.

If you are still torn: Hang En is the more famous single moment, Tu Lan is the better sustained few days. Most first-time visitors are happier with Hang En.

If neither has dates

Both fill up in high season. If Oxalis has no dates that fit, the strongest bookable alternative is Hang Pygmy, the world's fourth largest cave, run by Jungle Boss as a two-day, one-night trip at around $310 (7,900,000 VND, prices checked June 2026). You abseil in and camp inside on an underground river, which covers a lot of the same ground as Hang En for a similar price, and it is usually available on shorter notice.