Right, confession first. When we pulled into the car park at Postojna Cave on our Slovenia road trip, I had my cynical hat on. Coaches lined up nose to tail, a gift shop roughly the size of a small airport, and hundreds of people clutching timed tickets like they were queuing for a ride. It did have “theme park” written all over it.
Then the little cave train sped off into the dark, picked up far more speed than I expected, and within a minute all 3 of us had gone quiet.
So is Postojna Cave and Predjama Castle a tourist trap? Bits of it, yes. Is it worth doing anyway? For most people, I’d say so. And pairing the cave with Predjama Castle (a medieval castle wedged into the mouth of a cliff, which still makes zero structural sense to me) turns it into one of the best day trips in Slovenia. We drove over from our base in Ljubljana, did both in a day, and came home with plenty of opinions. This is everything I’d want to know before going again: tickets, timings, the best order, getting there with and without a car, and what’s worth paying extra for. Plus what isn’t.
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Postojna Cave and Predjama Castle: Quick Facts
Prices correct as of September 2026, converted at roughly €1 = £0.86 = $1.14.
Is Postojna Cave Worth It?
Short answer: yes, I loved it, but with a couple of asterisks.
The cave itself is ridiculous, in the best way. About 5km of it is open on the standard tour, with halls so big you lose any sense of being underground, stalactites dripping off the ceiling like frozen candle wax, and a pure white five-metre stalagmite called the Brilliant that everyone crowds around for a photo. I’ve done a fair few caves over the years (ice caves in Austria and Romania included) and Postojna is right up there for sheer scale and variety.
The asterisks? It’s slick, it’s busy, and it isn’t cheap. In peak season thousands of people pass through every day, groups are big, and the whole operation runs with the efficiency of an airport. If you want quiet, raw, hard-hat caving, you’ll find it a bit too polished. And the price for a 90-minute tour made my wallet wince slightly.
Who’ll love it:
- Families (the train alone wins kids over, and a few adults I could name)
- First-timers to Slovenia who want a big-hitter day out
- Anyone who isn’t keen on steep stairs, since the walking is easy going
- Road-trippers heading between Ljubljana and the coast, because it’s bang on the route
Who might not: people who hate crowds and would rather trade the train for a proper hike. More on that when I compare it with Škocjan further down.
Getting to Postojna Cave and Predjama Castle
Postojna sits just off the A1 motorway, which makes it one of the easiest big sights in the country to reach. Here’s how the options stack up.
By car from Ljubljana. About 50km and 45 minutes. This is how we did it and, honestly, it’s the least faff by a mile because you can hop to Predjama afterwards without checking a timetable. Remember Slovenia needs a motorway vignette (sticker’s gone, it’s digital now) before you use the A1. If you’re sorting wheels, compare Slovenia car hire deals before you land, and our guide to hassle-free car rentals covers the insurance traps.
By car from the coast. Piran and Koper are roughly an hour away, so it works nicely as a stop on the way inland or out. If you’re building the whole route, our Slovenia road trip itinerary shows how it all links up.
Parking. There’s a big paid car park at the cave park, currently around £5 (€6, $7) for the day for a car. Predjama has its own smaller paid car park right in front of the castle, and it fills up in summer.
By train or bus. Trains run from Ljubljana to Postojna station, usually around an hour or a bit more. The catch? The station is on the far side of town, about 2km from the cave, so it’s a 25 to 30 minute walk (flat and easy enough, just dull). Buses are often the better shout, as some stop right at the cave park (look for the Postojnska jama stop) rather than in town. Expect roughly £5 (€6, $7) each way on the bus.
The seasonal shuttle to Predjama. From late June to the end of September a shuttle bus runs between the cave park and the castle, roughly hourly, taking about 20 minutes. It’s only for combo ticket holders, costs about £1.70 (€2, $2.30) return, and it’s cash on the bus. Outside that window you’re looking at a taxi (the ticket office will call one for you) or skipping the castle.
Organised tours. If you don’t fancy juggling buses and shuttle times, a tour from Ljubljana does the lot. I’d check out Postojna day tours from Ljubljana and make sure the ticket price is included, since some aren’t.
Where to Stay in Ljubljana
Postojna Cave Tickets and Combo Deals
This is where people overthink it, so let me keep it simple. The official park website sells everything, and it's the only place selling standalone Postojna Cave tickets (they're quite vocal about warning people off unofficial resellers). Online prices on the packages are noticeably cheaper than adding everything up separately.
The single tickets look like this:
- Postojna Cave: £30 (€34.90, $40)
- Predjama Castle: £21 (€24, $27)
- Cave under Predjama Castle: £21 (€24, $27)
- Vivarium: £11 (€12.80, $15), park ticket office only
- Expo Cave Karst: £11 (€12.80, $15), park ticket office only
And the combos, which is where the savings are:
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| Ticket | What's included | Adult price | Worth it for |
|---|---|---|---|
| Postojna Cave only | Cave tour with the train | £30 (€34.90, $40) | Short on time, no castle |
| Two Adventures | Cave + Predjama Castle | £43 (€49.90, $57) | Most people. The sweet spot |
| 100% Cave Experience | Cave + Vivarium + Expo Cave Karst | £38 (€44.40, $51) | Rainy days and cave nerds |
| Cave, Castle and Vivarium | Cave + Predjama Castle + Vivarium | £47 (€55, $63) | Olm fans who want the castle too |
| Full Park Experience | Cave + Castle + Vivarium + Expo | £51 (€59.90, $68) | Families making a full day of it |
| Castle + Cave under Predjama | Castle + seasonal cave tour | £34 (€39.50, $45) | Castle lovers, May to September |
Should you book ahead or turn up? In July and August, book. Tour slots do fill, and you don't want to spend your day loitering by the souvenir shop waiting for a 4pm tour. In the quieter months you can often buy on the day, but booking online gets you the package discounts anyway, so there's not much reason not to.
Recommended Tours and Tickets
The Postojna Cave Tour: What Actually Happens
Right, the bit everyone wants to know. 🚂
You’re asked to arrive about 30 minutes before your slot, and boarding starts 15 minutes before the tour time. Everyone gets split into language groups (English, German, Italian or Slovenian), then you squeeze onto the open cave train. And it moves. Not a gentle trundle either. The tunnel walls whip past close enough that you instinctively pull your elbows in, and the lights flick past these huge formations before you’ve had time to point at them. It’s daft, and brilliant.
The train covers most of the distance. After about 10-15 minutes you hop off at the underground station and follow your guide on foot for just over a kilometre, which takes around an hour. The path is smooth, non-slip concrete and mostly gentle, though there’s one 200m stretch up at a 20% gradient (and the same back down) that’ll get you puffing a bit. Then it’s back on the train and out into daylight. Total time: about 90 minutes.
A few practical bits:
- Audio guides: available in 19 languages for about £3.40 (€3.90, $4.40). The live guide was fine for us, so we skipped it. It is not needed honestly!
- Photos: allowed, but no flash and no tripods. Your phone’s night mode is your friend down there
- Bags: big backpacks, umbrellas and the like aren’t recommended inside. There are lockers in the Expo pavilion
- No food, no pets: pets can wait in free kennels (subject to space)
- Accessibility: buggy-friendly on the main path, and visitors with limited mobility can do a train-only version
The standout moments for me were the Russian Bridge (built by prisoners of war, walking over it is surreal), the dazzling white Brilliant, and the concert hall at the end, a chamber so enormous they’ve actually held concerts in it.
Meet the Olm, Slovenia's "Baby Dragon"
So here’s a creature that has no business existing. The olm (or “human fish”, thanks to its pale pinkish skin) is a blind, cave-dwelling salamander about the length of a pencil. Legend has it that locals once found them washed out of caves after heavy rain and assumed they were baby dragons. Postojna has leaned into that one hard. Dragon plushies everywhere.
You’ll see a couple near the end of the regular cave tour, in a dimly lit tank. And I’ll be honest, the first time I found myself squinting into a black tank for a good 20 seconds before one of the lads said “there, the pink sausage thing”. Once you spot it, though, it’s weirdly captivating. It barely moves. Totally unbothered by the hundred phones pointed at it.
If you want more, the Vivarium is a small underground lab-style exhibit near the cave entrance with more olms and other cave critters, plus info on how they live.
Is the Vivarium worth it? If you’re a wildlife fan or have curious kids, it’s a decent add-on as part of a combo. As a standalone at £11 (€12.80, $15), I’d pass. You see the olm on the main tour anyway.
Gear we actually travel with
Passport holders, packing cubes, travel wallets. Stuff that earns its place in the bag.
Browse the shopPredjama Castle: The Castle in the Cliff
If the cave is the headline act, Predjama Castle is the one you’ll be showing people photos of back home. It sits halfway up a 123-metre cliff, built right into the mouth of a cave, and it’s been there in some form for more than 800 years. We rounded the last bend in the car and all three of us said some variation of “no way” at the same time. I spent a good few minutes craning my neck from the car park trying to work out where the castle stopped and the rock started. (Answer: it doesn’t really.)
The story that goes with it is brilliant. In the fifteenth century the castle belonged to Erazem Lueger, a robber baron who’d fallen out with the Habsburgs. He held out against a siege for over a year, supposedly getting fresh food through a secret passage in the cave behind the castle and taunting the besiegers by lobbing cherries at them. His downfall? A servant tipped off the enemy about when he visited the loo, which sat in a more exposed part of the castle. One cannonball later, that was that. Not the most dignified way to go.
Inside you get:
- Furnished rooms set up as they might have looked centuries ago
- A chapel, a dungeon and some good grim torture props
- Erazem’s hideaway, the natural cave at the very top
- Wobbly-knee views down into the valley from the upper levels
The guided tour is via a free app in 19 languages (download it before you arrive, the signal can be patchy), or you can rent an audio guide at the ticket office for about £2.50 (€2.90, $3.30). Allow an hour to an hour and a half. Note there are lots of stairs, so it isn’t suitable for buggies or visitors with limited mobility, and drones are banned because rare birds nest in the cliff.
The Cave Under Predjama Castle
Here’s one a lot of people miss. Beneath the castle is a separate cave system, one of the biggest show caves in Slovenia, and you can tour its upper levels on a guided visit of around 45 minutes. It’s a totally different vibe from Postojna. No train, no lighting rig, no crowds. You’re handed a torch and that’s your light source. Kids from age six can do it.
Is it worth adding? If you liked Postojna but found it a bit polished, yes. It feels rougher round the edges in a good way, and you get a much better sense of how Erazem’s secret supply route might have worked. It’s £21 (€24, $27) on its own, or grab the castle plus cave combo for £34 (€39.50, $45).
The Best Order and Timings for One Day
Cave first or castle first? The park itself recommends doing Predjama Castle in the morning and the cave in the afternoon, and after doing it, I agree. Predjama is small and gets rammed once the coach tours arrive, so getting there around opening time means you get the narrow staircases mostly to yourself. Then you’ve got a fixed cave slot to aim for, rather than rushing the castle to make a train.
Tour slot tips:
- Pick an early-afternoon cave slot (2pm or 3pm), which gives you a relaxed morning at Predjama and lunch in between
- Avoid the late-morning cave slots in summer if you can, they’re the busiest
- If you’re driving on to the coast afterwards, a 2pm tour gets you to Piran in time for sunset drinks
Here’s how a day looks, with and without a car:
← Swipe to scroll on mobile
| Time | With a car | Without a car (shuttle season) |
|---|---|---|
| Early morning | Leave Ljubljana, 45 minutes to Predjama via the A1 | Early bus from Ljubljana to the Postojnska jama stop |
| Castle opening | Predjama Castle before the coaches arrive | Collect tickets at the cave park, grab a coffee |
| Late morning | Cave under Predjama tour (May to September) | Morning shuttle to Predjama, then the castle |
| Lunch | Lunch by the castle, then drive 15 minutes to Postojna | Quick bite near the castle, early-afternoon shuttle back |
| 2pm to 3:30pm | Postojna Cave tour (arrive 30 minutes early) | Postojna Cave tour (arrive 30 minutes early) |
| Late afternoon | Vivarium if it's on your ticket, then on to the coast or back to Ljubljana | Bus back from the cave stop, or walk to the station for the train |
Travelling outside the shuttle season without a car? Honestly, it gets fiddly. You can do the cave on its own easily by public transport, but adding Predjama means a taxi both ways. At that point I'd just book one of the Postojna and Predjama tours with transport from Ljubljana and let someone else do the thinking.
Where to Eat Nearby
Food is where the “tourist machine” side of Postojna shows most. The cave park has everything from grab-and-go snacks to sit-down restaurants and the Hotel Jama restaurant, and it’s all perfectly decent. It’s also priced like you’ve got nowhere else to go (because, well, you don’t really).
Your options:
- On site at the cave park: convenient, fine quality, pricier. Good if you’re squeezed for time between slots
- Next to Predjama Castle: there’s a traditional inn right below the castle with a terrace facing the cliff. The view does a lot of the heavy lifting, and it’s a lovely spot for a long lunch
- Postojna town (2km away): cheaper, more local. Look out for “dnevno kosilo” (a daily set lunch) chalked up outside gostilnas, usually a soup, main and salad for a fair bit less than you’d pay at the park
- Supermarket picnic: the budget winner. Grab bread, local cheese and a few pastries from a supermarket in town and eat at Predjama with that view. Can’t beat it
Postojna vs Škocjan Caves
This is the big debate, and you'll find passionate people on both sides. Škocjan Caves are about half an hour's drive from Postojna, UNESCO-listed, and home to one of the biggest underground canyons in the world. You walk across a narrow bridge with the Reka River roaring far below you, and it's the kind of moment that stays with you.
Here's my quick, honest comparison:
← Swipe to scroll on mobile
| Feature | Postojna | Škocjan |
|---|---|---|
| Adult price | £30 (€34.90, $40) | Around £21 (€24, $27) in summer, a little less off-season |
| Tour length | About 90 minutes | About 2 hours |
| Walking | Just over 1km, mostly easy | Around 3km with lots of steps |
| Train | Yes, the famous cave train | No, it's all on foot |
| Crowds | Busy, big groups in summer | Noticeably quieter |
| Wow factor | Formations, variety and the train ride | The vast underground canyon and bridge |
| Best for | Families, first-timers, less mobile visitors | Active adults who want something wilder |
Which should you pick? If you've got kids or anyone who struggles with stairs, Postojna, no contest. If you're a couple of adults who hate crowds and like a bit of drama, Škocjan wins. And if you're pairing it with a castle in the same day, Postojna is the obvious choice because Predjama is right there. We went with Postojna for exactly that reason, and Škocjan's firmly on my list for next time.
What I'd Skip
Every big attraction has its padding, and Postojna has plenty. Here's where I'd save my money and time:
- The standalone Vivarium ticket. You see olms on the main tour. Only worth it bundled into a combo
- Expo Cave Karst on a sunny day. It's a well-made exhibition, but if the weather's good you're better off outside at Predjama
- The audio guide in the cave. The live guide covers the essentials, and you'll be too busy gawping to listen properly anyway
- Souvenir shop dragon tat. There's a lot of it. Plushies, fridge magnets, olm-shaped everything. One of the lads came dangerously close to buying a dragon keyring
- Late-morning cave slots in summer. Peak crowd time. Go early or after lunch
Where to Stay
You’ve got three sensible bases, and it mostly depends on where the day sits in your trip.
Postojna itself. Staying overnight means you can grab the very first cave tour before anyone else arrives, which is a big win in summer. The Hotel Jama sits right in the cave park and occasionally does ticket discounts for guests. The town has cheaper guesthouses and apartments too. Browse Booking.com stays near Postojna to compare.
Ljubljana. Where we based ourselves, and where most people will. It’s only 45 minutes away, there’s far more going on in the evenings, and you can mix Postojna in with other day trips (we did Lake Bled without the crowds the same week). I’ve put together our favourite bits of the capital in Ljubljana in 2 days.
The coast. Piran is about an hour away and makes a gorgeous overnight after a day underground. If you’re heading on into Croatia after that (which lots of road-trippers do), our Croatia hub will point you in the right direction.
My Final Thoughts
A bit of both, and I’m fine with that. Yes, there are coaches, dragon keyrings and a queue for the loos. But you also get a train ride into a cave that makes you feel about six years old, a castle jammed into a cliff with a toilet-based legend attached, and a proper day out that slots perfectly between Ljubljana and the coast. Book the combo, go castle first, bring a jumper, and ignore the souvenir shop. You’ll have a cracking day.
It was one of the highlights of our trip, and you’ll find the full route in our Slovenia road trip itinerary. Heading north next? Our guide to Lake Bled without the crowds has the tricks we used to dodge the coach tours there too. And for everything else, from Ljubljana to the Soča Valley, head over to our Slovenia travel hub.
FAQs
Is Postojna Cave worth the money?
Yes, for most first-time visitors. It’s pricey for a 90-minute tour and it’s busy, but the scale of the cave and the train ride make it one of Slovenia’s proper big-hitters. We went in sceptical and came out converted, mostly.
Can you visit Postojna Cave and Predjama Castle in one day?
Easily. They’re only 9km apart, and five or six hours covers both comfortably. We did the pair in a day from Ljubljana and still had time for a long lunch.
How cold is it inside Postojna Cave?
It stays at 10°C (50°F) all year, and the train ride makes it feel colder. Take a jumper or light jacket even in August. I didn’t, and I spent half the tour with my hands in my armpits.
Can you get to Postojna Cave without a car?
Yes. Buses and trains run from Ljubljana, and some buses stop right at the cave park. Predjama is the tricky bit outside the summer shuttle season, so non-drivers are often better off on an organised tour for the pair.
Should I choose Postojna or Škocjan Caves?
Postojna for families, easy walking and pairing with Predjama Castle. Škocjan for fewer crowds and a wilder, more physical walk through a massive underground canyon. If I had to pick one for a first visit to Slovenia, I’d still go Postojna, just.
Sources checked
- Postojna Cave Park: Tickets, single and combo ticket prices
- Postojna Cave Park: Postojna Cave Tours, tour length, temperature, photo rules, audio guides
- Postojna Cave Park: Tour Timetables, cave and Predjama opening times, recommended order
- Postojna Cave Park: Shuttle Bus, seasonal shuttle dates, times and fare
- Postojna Cave Park: Predjama Castle Tour, castle visit, app guide, cave under the castle
- Škocjan Caves Park, tour details and temperature
- XE Currency Converter, exchange rates used for £ and $ conversions
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