You get to the Mulu caves by flying there, because there is no road. A MASwings turboprop from Kuching takes about 1 hour 20 minutes and lands at a tiny airstrip a short van ride from the park gate. From there you buy a five-day park pass, book a licensed guide for each cave, and walk into some of the biggest cave passages on the planet. Gunung Mulu National Park is a UNESCO World Heritage Site in northern Sarawak, and the headline experiences are Deer Cave, the nightly bat exodus, Clearwater Cave, and, for the fit and determined, the Pinnacles climb.
Part of our guide to Discovering Sarawak.
I have sent a steady stream of visiting friends to Mulu since 2019, and flown up myself more than once. It is the single most impressive place in Sarawak I can point someone toward. It is also expensive, weather-dependent, and a genuine logistical faff, and I would rather you knew that before you booked the flight than after.
Key Takeaways
- The only practical way in is a MASwings flight (from Kuching, Miri, or Kota Kinabalu). No road reaches the park.
- The park pass is a five-day Mulu World Heritage pass: RM30 for a foreign adult, RM10 for a foreign child 6 to 18, free under 6. Verified June 2026.
- You cannot wander the caves alone. A licensed park guide is required for every cave tour, and the popular ones sell out in peak season.
- The four show caves are Deer Cave, Lang Cave, Clearwater Cave, and Wind Cave. Deer Cave holds one of the world’s largest cave passages.
- The bat exodus from Deer Cave happens most evenings, roughly 5:30pm to 6:30pm, but it can be a no-show if the weather turns.
- The Pinnacles is a hard 3-day, 2-night trek, not a day walk. Do not underestimate it.
- Three full days covers the main caves comfortably. Book your guided activities through mulupark.com well in advance.
What is Gunung Mulu and why is it famous?
Gunung Mulu National Park covers a chunk of rainforest, two sandstone-and-limestone mountains, and a cave system that holds several genuine world records. It was inscribed as a UNESCO World Heritage Site in 2000. The reason is partly the caves: Mulu holds the Sarawak Chamber, the largest known cave chamber in the world by floor area, the Deer Cave passage, one of the largest cave passages anywhere, and Clearwater Cave, the longest cave in Southeast Asia at well over 200km of mapped passage.
What that means on the ground is that you walk into spaces that do not feel like they should exist. Deer Cave’s main passage is wide enough and tall enough to swallow several cathedrals, with daylight pouring in from both ends and a smell of ammonia from millions of bats overhead. You do not need to be a caver to see it. The four main “show caves” have plank walkways and lighting, and you visit them on a guided walk in normal shoes.
How do you actually get to Mulu, and what does it cost?
You fly. There is no road to Mulu, which catches a lot of people out. MASwings, the regional turboprop arm of Malaysia Airlines, runs the only scheduled flights, with daily services from Kuching (about 1 hour 20 minutes), Miri (about 30 minutes), and Kota Kinabalu (about 55 minutes). From Kuching it is one flight a day in each direction, so your whole trip has to be planned around it.
Here is the part I want you to take seriously: the flights are small, infrequent, and weather-cancellable. These are little ATR turboprops landing at a jungle airstrip. When the weather closes in, flights get delayed or scrapped, and because there is only one a day, a cancellation can cost you a whole day of your trip or strand you in Mulu an extra night. There is no road to fall back on. Build a buffer day into your itinerary and do not book a tight onward connection out of Miri or Kuching the same afternoon you fly out of Mulu.
Fares swing hard with season and how early you book. I have seen Kuching to Mulu return tickets land anywhere from around RM300 to well over RM1,000 depending on dates and demand, so book early and be flexible. From the airstrip, a van to park HQ runs about RM5 to RM6 per person, or you can walk the 1.5km if you travel light.
The park entry itself is cheap by comparison. The Mulu World Heritage pass, checked against mulupark.com in June 2026, is a five-day pass regardless of how long you stay:
| Visitor | Park pass (5 days) |
|---|---|
| Foreign adult | RM30 |
| Foreign child (6 to 18) | RM10 |
| Malaysian adult | RM15 |
| Malaysian child (6 to 18) | RM5 |
| Under 6 | Free |
On top of that, a conservation fee of RM20 applies to visitors using a freelance guide or tour operator, with extra fees for Camp 5 and the Summit and Headhunters trails. See the official mulupark.com plan-your-trip page for the current schedule, and treat any third-party number, mine included, as a guide to confirm on the day.
What are the main caves, and do you need a guide?
You need a guide. This is not optional and not a money-grab: you are required to visit the caves on a tour led by a licensed park guide, and the tours run to a fixed daily timetable. The four show caves split into two easy half-day outings.
- Deer Cave and Lang Cave are usually done together in an afternoon, timed so you finish at the bat observatory for the exodus. Deer Cave is the giant; Lang Cave next door is smaller but has the prettier formations.
- Clearwater Cave and Wind Cave are the other pair, reached by a short longboat ride up the river. Clearwater is part of that record-breaking system, with a cold underground river you can sometimes swim in at the entrance pool. Wind Cave has the stalactite-and-stalagmite “King’s Room.”
Guided show-cave tours start around RM20 to RM35 per cave through the park. The adventure caves, the harder caving routes with helmets, headlamps, and crawling, cost more and need a separate booking and a basic fitness check.
What is the bat exodus, and is it guaranteed?
Most evenings, between roughly 5:30pm and 6:30pm, somewhere between 2.5 and 3.5 million wrinkle-lipped bats pour out of Deer Cave to feed. They leave in long ribbons that corkscrew up against the cliff and snake out over the forest, and on a good night it goes on for half an hour. You watch from the bat observatory, an open deck about 3.8km from park HQ along the plank walk to Deer Cave, so it is built into the afternoon Deer Cave tour.
It is the best free wildlife show in Sarawak when it happens. The catch, and this is a real one, is that it does not happen on demand. If rain moves in or the conditions are wrong, the bats stay put and there is no exodus at all. I have sat on that deck with a group, watched the sky go grey, and walked the 3.8km back in the dark fair gutted, as we’d say back in Manchester, meaning deeply disappointed, having seen nothing but a few stragglers. There is no rain check and no refund on your evening. Some nights the bats simply do not fly, full stop, and no guide can make them.
What about the Pinnacles?
The Pinnacles are the razor-sharp limestone spikes on the side of Gunung Api, some of them 45m tall, and the climb to the viewpoint is the hardest thing most visitors attempt at Mulu. Be clear with yourself about what it involves: it is a 3-day, 2-night expedition, not a day hike. You take a longboat and a forest walk to Camp 5, sleep in a basic hut, and on the middle day climb roughly 2.4km of brutal near-vertical trail with fixed ropes and ladders to the viewpoint and back.
People turn around on that climb every week because they have underestimated it. There are timed checkpoints, and if you are too slow the guide will send you back down without reaching the top. If you are reasonably fit and want the signature Mulu adventure, it is worth every aching muscle. If you are not, do the caves and the canopy skywalk and skip it without guilt.
What else is worth doing?
The Mulu Canopy Skywalk is the easy highlight beyond the caves. At around 480m it is one of the longest tree-based walkways in the world, strung between forest giants 15m to 25m up, and the morning tour runs about RM55 per person including the guide. It is gentle, suitable for most ages, and a good first-morning activity while you find your feet.
Beyond that there are night walks, river trips to a nearby Penan settlement, and harder adventure caving for people who want to crawl and wade rather than stroll a plank walk. A night walk is a cheap way to see the forest do its second shift after dark.
How many days do you need, and where do you stay?
Three full days is the sweet spot for most people: one pair of caves and the bat exodus, the other pair of caves plus the canopy skywalk, and a third day for a night walk, a river trip, or simply a buffer against a weather-hit flight. Add the Pinnacles and you need five or six days total.
Accommodation is limited and you should book it the moment your flights are confirmed. Inside the park, HQ has a hostel dorm bed at around RM80, and private rooms and longhouse suites running from roughly RM325 to RM475 a night, all booked through mulupark.com. Just outside the gate there are cheaper homestays and a backpacker place from around RM20 to RM66 a bed, plus the five-star Mulu Marriott if your budget runs that way. Whatever you pick, the supply is small. In peak season, June to September and the Malaysian school holidays, beds and guides sell out, and the park’s own advice is blunt: once the guides are booked, there is nothing they can do for you.
A word on the facilities, since some of the people I have sent up arrived with the wrong picture. Park HQ is comfortable but basic: a remote jungle outpost reached by a single daily flight, so expect simple food, a small shop, patchy connectivity, and the occasional power flicker. I went for caves the size of stadiums, and made my peace with the lack of room service.
So, is Mulu worth the hassle?
Go if you want to stand inside one of the largest cave passages on earth and watch three million bats spiral out over the rainforest at dusk, and you accept that getting there means an expensive flight that the weather can cancel, guides you must book months ahead, and a chance the bats take the night off. Skip it, or save it for a longer Borneo trip, if you want something cheap, spontaneous, and weatherproof.
Planning the rest of your Sarawak run? Pair Mulu with our guides to Bako National Park for the coastal wildlife day and Sarawak Cultural Village for an easy half-day near the city, and build your buffer day in before you book the flights.
Last thing, from the bat observatory: bring a headtorch even for the afternoon tour. If the exodus runs long and good, you will not want to leave, and the 3.8km plank walk back to HQ is pitch dark by 7pm.
Keep exploring Kuching Insider: Bako National Park, Bario and the Kelabit Highlands, and why nature lovers choose Sarawak.