Son Doong is sold out until 2028. Here's what to do instead

The short answer

Son Doong is sold out for 2026 and 2027, and the 2028 spots that opened after the 60 Minutes feature are filling fast. You have two honest choices: get on a waitlist and wait two-plus years, or book one of the giant caves you can actually do this season. Our pick for most people is Hang Pygmy, the world's fourth largest cave, at around $310 (7,900,000 VND, prices checked June 2026) with Jungle Boss. It gets you the deep-cave overnight, the abseil and the scale for roughly a tenth of the Son Doong price, and you can usually book it for your dates.

Why Son Doong is sold out

Two things collided. First, the supply is fixed on purpose: only about 1,000 people are allowed into Son Doong in a whole year, a cap set with the park authorities to keep the cave from being trampled. One operator, Oxalis, holds the licence, and the season only runs January to August because the river inside floods the rest of the year.

Then in March 2026, CBS aired a 60 Minutes segment with Scott Pelley walking through the cave. Millions of people saw the world's largest cave passage for the first time and a chunk of them tried to book the next morning. Against a 1,000-person annual cap, that is all it takes. 2026 and 2027 went, and Oxalis opened 2028 to absorb the overflow. There is no fast lane. You either wait or you go somewhere else.

What Son Doong actually costs

Around $3,000 (79,500,000 VND) per person for the four-day, three-night expedition with Oxalis. That covers the permit, a large guiding and safety team, porters, all food and the gear. It is a genuinely fair price for what it is, a fully supported expedition into the biggest cave on earth, but it puts the trip out of reach for a lot of people before the waitlist even enters the picture. The caves below sit between $292 and $1,375, and three of them are bookable for the current season. Prices checked June 2026.

Hang Pygmy: the best alternative

Hang Pygmy is the world's fourth largest cave, and on the two-day trip you trek in through Hang Over, take a short abseil down into the Pygmy chamber and sleep one night underground. That is the core of what makes Son Doong special, the sheer volume of rock over your head and a night spent inside it, delivered on a weekend instead of a four-day expedition.

It runs around $310 (7,900,000 VND, prices checked June 2026) with Jungle Boss, who you can book direct. Expect a 10m abseil rather than anything technical, river sections and boulder scrambling, and a real challenge without needing to be an athlete. The minimum age is 15. If you only read one recommendation here, this is it: closest value to the Son Doong feeling, and almost always available.

Hang En: the gentler giant

Hang En is the world's third largest cave, and it is the easiest of these to do. You trek in, camp on a sandy beach beside an emerald pool inside the cave, and wake to thousands of swifts pouring out of the entrance at sunrise. That single moment is the one most people name as the best of their entire Vietnam trip.

It is around $333 (8,800,000 VND, prices checked June 2026) for two days and one night, and it is Oxalis-only, since they hold the licence for it. The trekking is moderate rather than hard, which makes Hang En the right call if you want the giant-cave overnight without the abseiling and rope work. If you are travelling with someone less keen on the rough stuff, point them here.

Kong Collapse: closest to Son Doong scale

If what you actually want is the expedition, the days of trekking and the sense of being somewhere almost no one goes, Kong Collapse is the closest match. It is a five-day, four-night trip built around a 100m abseil, done in staged drops, down the wall of a 450m-deep doline, a sunken jungle where a cave roof collapsed. Along the way you also pass through Hang Over and Pygmy, so you get the fourth largest cave folded into the same trip.

It runs around $1,375 (35,000,000 VND, prices checked June 2026) with Jungle Boss, book direct. That is more than the others here, but it is still a fraction of the Son Doong price for a comparable length and arguably more rope work. Groups are capped at ten and the minimum age is 16. Be honest with yourself about fitness: this is rated strenuous and they ask for medical clearance.

Tu Lan and Hung Thoong: the wildcards

Tu Lan is the water trip. It is a system of river caves around Tan Hoa that you swim through, jungle and karst on every side, and it was used as a filming location for Kong: Skull Island. The three-day Encounter is around $292 (7,700,000 VND) with Oxalis, with a day version from about $78 and a full expedition near $680. Pick this if swimming through caves sounds better to you than a single big chamber.

Hung Thoong is the quiet expedition. Four caves over three days, two nights of jungle camping, around $470 (12,000,000 VND, prices checked June 2026) with Jungle Boss, book direct. It sits between a single overnight and a Son Doong-scale commitment, and because it has no headline name, you get real wilderness without the queue.

What you actually give up

Be clear-eyed about it. Son Doong has a 90m calcite wall called the Great Wall of Vietnam, two giant collapsed dolines with their own patches of jungle and cloud forming inside, and a passage so large a Boeing could sit in it. None of the alternatives is that big, and the four-day length means a kind of immersion the shorter trips cannot match.

What you do not give up is the core feeling: standing inside a space too large for your eyes to make sense of, sleeping under a roof of rock, walking ground that sees a few hundred people a year. Hang Pygmy and Hang En both deliver that. Most travellers who book an alternative because they could not wait come back saying it was the best thing they did in Vietnam, not a consolation prize.

How to get on the Son Doong waitlist

If it has to be Son Doong, do two things now. Register your interest for 2028 directly with Oxalis, the only licensed operator, as early as you can, because the dates open in batches and the good months go first. Then set up an availability alert so you hear the instant a cancellation appears, which is the only other way a 2026 or 2027 spot ever frees up.

Practically, the people who get the cancelled spots are the ones who can say yes within the hour and are already trained for it. Son Doong involves eight to ten hours of trekking a day, river crossings and a 90m climb, so if you are serious about the waitlist, start getting fit now rather than waiting for the email. While you wait, do Hang Pygmy or Hang En. You will be a stronger candidate for Son Doong and you will not have spent two years just refreshing a booking page.