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Experience the stunning Postojna Cave and Predjama Castle on a 5-hour guided tour from Koper, including transportation, a cave train ride, and photo stops for €79.
Discover the fascinating underground world of Slovenia’s Postojna Cave and the dramatic Predjama Castle on a well-rounded 5-hour tour departing from Koper. Priced at $79 per person, this experience is perfect for travelers interested in exploring one of Slovenia’s most iconic sights without the hassle of planning. The tour includes guided exploration, an electric train ride through the cave system, and a photo stop at the largest cave castle in the world.
While not suitable for visitors with mobility issues, claustrophobia, or those over 80, it offers a captivating glimpse into Slovenia’s karst landscape. With an average rating of 4.6 out of 5 from 34 reviews, this tour consistently impresses with knowledgeable guides and stunning scenery.


The tour begins at KoperTours, with guests advised to arrive 15 minutes early. The meeting point is marked by an orange beach flag with the Hop & Taste logo, located next to the blue KOPER TOURS SOUVENIR SHOP. This spot is easy to find and provides a clear starting point for a smooth experience.
The journey starts with a bus or coach ride lasting about one hour, giving travelers time to relax and enjoy scenic views of the Slovenian countryside. The return trip also takes about an hour, ensuring the tour fits comfortably into a half-day schedule.
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Postojna Cave is the largest known cave system in Slovenia and the second-largest accessible to visitors worldwide. It stretches over 20 kilometers of underground passages carved by natural water currents within the karstic limestone. The guided tour covers approximately two hours, during which visitors can marvel at vast chambers, stalactites, stalagmites, and other impressive formations.
The electric train ride is a highlight, taking guests through a significant portion of the cave. This allows for an easy and comfortable way to experience the cavern’s scale without exhaustive walking. The cave temperature remains around 13°C (55°F) in summer, so warm clothing is recommended.
Wildlife enthusiasts may also enjoy spotting some of the cave’s unique inhabitants, such as baby olms, an endangered species of aquatic salamander that can only be found in a handful of locations worldwide.

Just ten minutes from the caves is Predjama Castle, a medieval fortress built into the mouth of a high, flat limestone cliff. This cave castle, sitting above the Lokva stream, is the largest of its kind in the world and offers an extraordinary sight. Visitors can spend about 45 minutes here taking photos and admiring the castle’s dramatic setting.
The castle’s architecture is unique, as it is pressed into a cavern hollowed out of the rock face, creating a striking contrast with the surrounding landscape. The photo stop is designed to provide ample opportunity to capture the castle’s grandeur and its natural surroundings.
The entire journey takes place via air-conditioned vans, minibuses, or coaches, making for a comfortable ride. The tour is conducted with a driver and guide, both of whom are praised for their knowledge and friendliness.
The tour is designed for groups, but it’s not specified whether it’s a small-group experience. Nevertheless, reviews mention the efficient transportation and professional driving, making the overall experience smooth and pleasant.
More Great Tours NearbyTravelers should bring their passport or ID card and thermal clothing, as the cave’s temperature remains cool in the summer. Sandals or flip-flops and shorts are not allowed, ensuring safety and comfort during the underground walk.
This tour does not include the entry fee to Predjama Castle, which is paid separately if visitors wish to go inside the castle itself beyond the photo stop. The tour does not include hotel pickup or drop-off, so guests should plan to meet at the designated location.
With an average rating of 4.6 out of 5, the tour is well-regarded by previous participants. The knowledgeable guides receive particular praise, with one being described as “personable and insightful”. The scenic bus ride through the Slovenian countryside is highlighted as a beautiful complement to the main attractions.
Some feedback notes minor issues, such as instructions being slightly confusing at the start, but overall, the quick adjustments by the staff and smooth logistics ensure a positive experience. The caves’ natural beauty and the imposing Predjama Castle are consistently described as incredible sights.
This tour is not suitable for individuals with mobility impairments, claustrophobia, or wheelchair users due to the nature of cave walking and confined spaces. It’s best suited for visitors comfortable with moderate walking and cool temperatures. The duration and physical requirements are manageable for most healthy adults, but travelers should be prepared for some walking and staircases within the castle.
This 5-hour guided experience from Koper offers a well-organized visit to two of Slovenia’s most captivating sites. The inclusion of transportation, guided commentary, and a photo stop makes it a convenient choice for those exploring the region. The electric train ride through the cave system provides a unique perspective on its immense chambers, while the Predjama Castle offers a dramatic photo opportunity.
Priced at $79, it presents good value considering the entrance fees included and the quality of guides. Travelers who enjoy natural wonders, medieval architecture, and scenic drives will find this tour a fulfilling half-day adventure.
“Took a little time to find our guide since the instruction in the email is different from the actual and no one updated us.”
Is transportation included in the tour?
Yes, transportation with air-conditioned vans, minibuses, or coaches is included for the entire 5-hour experience.
Can I visit Predjama Castle inside?
The tour includes a 45-minute photo stop at Predjama Castle. Entry beyond photos is not included and requires a separate ticket.
What should I bring on the tour?
Travelers should bring their passport or ID, thermal clothing, and wear closed shoes—sandals or flip-flops are not allowed.
Is this tour suitable for children?
The tour is not suitable for children with mobility issues, claustrophobia, or over 80 years old. It’s best for those comfortable with walking and cool environments.
How long is the cave tour itself?
The guided exploration of Postojna Cave lasts about two hours, including the electric train ride.
What is the temperature inside the cave?
The cave maintains a temperature of approximately 13°C (55°F) in summer, so warm clothing is advised.
Are the guides fluent in English?
Yes, the live tour guide conducts the tour in English.
Is this tour good value for the price?
Considering the entrance fees, transportation, and guided service, the $79 price offers good value for a comprehensive half-day trip.
Experience the stunning underground passages and dramatic castle setting that make this tour a highlight for visitors exploring Slovenia.
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