Postojna Cave and Predjama Castle tour from Ljubljana

Ride the underground train into a 2-million-year-old cave, then climb into a 13th-century castle built into the cliff.

A half-day tour from Ljubljana combines Postojna Cave—one of the world's largest karst caves—with a train ride through its galleries and halls, and Predjama Castle, a medieval fortress carved into the rock face above the cave entrance. The tour includes hotel pickup, an English-speaking guide, transport by air-conditioned minivan, and a 10% discount on both cave and castle entry fees. You choose whether to visit both sites or the cave alone at checkout.

Step-by-step itinerary

Visit Postojna Cave and Predjama Castle

• Travel from Ljubljana to Postojna Cave
• Explore Postojna Cave by train
• Observe cave formations and wildlife
• Travel to Predjama Castle
• Take self-guided audio tour of castle

The Experience

The day starts with pickup from your Ljubljana hotel and a drive to Postojna Cave, where you board a small train that carries you into the underground world. The Pivka River carved this cave over millions of years, creating a network of tunnels, galleries and passages lined with stalactites, stalagmites, curtains and petrified waterfalls. The train takes you past these formations and through the cave's largest halls; after the train section, you walk the remaining passages on foot with your guide. One of the cave's most unusual residents is the proteus—a blind, pale animal adapted entirely to life in complete darkness—which you may spot in the underground pools.

After the cave, you visit Predjama Castle, which sits at the cliff entrance to the cave system. Built in the 13th century, the castle clings to the rock face in a dramatic location that makes it instantly recognizable. You explore the interior with a self-guided audio tour available in multiple languages, moving through rooms and passages at your own pace while learning about the castle's medieval history and the unusual architecture that lets it blend into the cliff itself.

The entire outing runs about five and a half hours from hotel to hotel. Your guide handles the logistics and can point out details about both sites, though the castle exploration is self-guided once you have the audio device. The minivan is air-conditioned, and the tour suits all fitness levels, though the cave walk involves some uneven terrain and the castle has stairs.

What’s included

• Hotel pickup and drop-off in Ljubljana.
• transport by air-conditioned minivan.
• professional English-speaking guide.
• train ride through Postojna Cave's galleries and halls.
• self-guided audio tour of Predjama Castle in multiple languages.
• 10% discount on entrance fees for both attractions.

Good to know

Easy physical levelInfant seats availablePets welcome

Operated by Slovenian Wander

Is this one for you?Choose this shared tour if you want a guide leading you through Postojna Cave by train but prefer exploring Predjama Castle independently with an audio guide; book a self-guided option instead if you'd rather set your own pace at both sites.

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Top questions

What is the proteus and where do I see it in Postojna Cave?

The proteus is a blind, pale animal that lives in the underground pools and passages of Postojna Cave, adapted to complete darkness in its subterranean habitat. You may spot one during the train ride or the walking section of the cave, though sightings depend on the animal's movement and visibility on the day you visit.

Do I need to climb stairs to visit Predjama Castle?

Predjama Castle does have stairs as part of the interior layout. The self-guided audio tour takes you through the castle's rooms and passages, so you'll encounter steps as you move through the different levels of the medieval structure built into the cliff.

How long do I spend underground in the cave?

Postojna Cave includes both a train ride through the largest galleries and passages, followed by a walking section through additional chambers. The exact time varies, but the cave portion is the main event of the half-day tour, with the train carrying you past the most spectacular formations before you explore on foot.

Is the 10% discount applied automatically, or do I need to do anything?

The 10% discount on Postojna Cave and Predjama Castle entry fees is included through the tour operator's tourist agency and applied to your booking. The discounted entrance fees are shown at checkout when you select whether to visit both sites or the cave alone.

What's included in the tour price, and what costs extra?

Hotel pickup and drop-off, transport by minivan, an English-speaking guide, and the 10% discount on cave and castle tickets are included. The entrance fees themselves (€41.50 for both sites, or €29.50 for the cave alone) are paid separately, and gratuities for the guide are optional.

Can I visit just Postojna Cave without the castle?

Yes—at checkout you can choose to visit Postojna Cave alone for €29.50 per person, or both the cave and Predjama Castle together for €41.50 per person. Either way, the tour includes the guide, transport and hotel pickup.