Postojna Cave tour from Koper: Ride the underground train

The only cave where you ride a train through the halls.

A group or private tour from Koper to Postojna Cave, where you board an electric train to travel through a 24 km underground Karst system with galleries, tunnels and halls, then stop for photos at Predjama Castle, the world's largest cave castle. The tour runs five hours with a live English-speaking guide, transport from the port, entrance fees and basic accident insurance included. A minimum of four adults per booking is required.

Step-by-step itinerary

Stops and time spent at each

1. Postojna Cave1h 30m · entry included
2. Predjama Castle15m

Visit Postojna Cave and Predjama Castle

• Ride electric train through cave
• Observe human fish in cave
• Photo-stop at Predjama Castle

The experience

Postojna Cave is the only cave system where you travel by electric train instead of walking. The train carries you through 24 km of underground passages, past narrow tunnels and vast halls, and you'll see the human fish: a blind salamander that lives in these waters. The cave is open year-round and accessible to most travelers. The train does the work, so you're not hiking steep terrain or crawling through tight spaces.

After the cave, the tour stops at Predjama Castle for photos. Built into a cliff face above a cave entrance, it's the largest cave castle in the world and sits dramatically high in the rocks: a striking contrast to the underground passages you've just left. The stop is brief, but it frames the day's two sides of the same geology: one hidden, one visible from miles away.

Transport leaves from Koper port and returns there, so cruise passengers can time the return to their ship's departure. The tour runs in rain, so bring a jacket and non-slip shoes. Children from age one are welcome, though infants sit on an adult's lap. You can book a shared group tour or a private one. The shared option keeps costs down, while private gives you the schedule and pace to yourself.

What’s included

• Transport from Koper port by air-conditioned van or minibus.
• entrance to Postojna Cave and the electric train ride through the underground system.
• a photo stop at Predjama Castle.
• a live English-speaking guide.
• basic accident insurance.
• return transport to the port.

Options for this experience

2 options

Shared group tourUp to 15 people · Guide in English · No fixed timePickup is included

Private tourUp to 6 people · Guide in English · No fixed timeVan pickup is included

You'll see the exact price of each option when you check availability.See dates and prices

Before you book

Days and timesEvery day

AgesAdult (16 and older) · Youth (6 to 15 years) · Child (1 to 5 years)

GroupUp to 50

Live guideEnglish

Meeting point and pickupHotel pickup is optional; you can also go straight to the meeting point. Ends back at the starting point.You can choose from 3 pickup points.

Cancellation and refundsFree cancellation up to 24 h before the start. After that, no refund.

Prices and times updated yesterday

Good to know

Moderate physical effortNot recommended with heart problemsInfants must sit on laps

Operated by Istranka Tours

Is this one for you?Book the shared group tour if you're comfortable with other travelers and want the lower price. Choose the private tour if you prefer your own schedule and guide for the five hours. Either way, the electric train means you're not doing strenuous walking. The cave comes to you.

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Top questions

Can children come?

Yes. Ticket types: Youth (6 to 15 years); Child (1 to 5 years).

Can I take the cave train if I have mobility issues or poor fitness?

The electric train handles the main passage, so you're not walking long distances. However, the tour is not recommended for travelers with poor cardiovascular health, and you should have at least moderate physical fitness to manage the cave environment and the train boarding.

What is the human fish I'll see in Postojna Cave?

The human fish is a blind salamander that lives in the cave's underground waters. It's a rare creature adapted to life in total darkness, and seeing it is one of the unique moments of the cave visit.

How long does the tour take and when do I need to be back at the ship?

The tour runs five hours total. If you're a cruise passenger, you'll provide your ship's docking time and re-boarding time at booking, and the operator times the return to get you back to the port safely before departure.

Is there a minimum group size for this tour?

A minimum of four adults per booking is required. If you're booking alone or with fewer than four people, you'll need to join a shared group tour or arrange a private tour with others.

What's included in the price?

The tour includes transport by van or minibus from Koper port, the cave entrance fee, the electric train ride, a photo stop at Predjama Castle, a live English-speaking guide, and basic accident insurance. Food and drinks are not included.