Postojna is a must-visit spot for travelers eager to experience Slovenia’s impressive karst cave system and the dramatic Predjama Castle. What makes Postojna special isn’t just its size — it’s the intricate tunnels, stunning stalactites, and the chance to see the cave’s famed baby olm salamanders. I personally find the combination of underground adventure and medieval fortress fascinating, especially when you can explore both in one day. Tours like the small group trip from Ljubljana or the private tour from Trieste stand out for their personalized touch and smooth logistics.
If you’re wondering which tour to select, consider what kind of experience you prefer — a quick visit, a full day of exploration, or a family-friendly adventure. Some tours include scenic drives, others focus solely on the caves. Read on for detailed insights into each option, helping you find the best fit for your trip.
Quick Overview
Our list features nine of the best Postojna tours, covering a range of styles — from guided day trips from Ljubljana and small-group adventures to private tours from Trieste, and even combinations with Lake Bled. Whether you’re short on time or want a more in-depth experience, you’ll find options that suit your schedule and interest. Some tours highlight cave train rides and castle visits, while others focus on exploring the underground world and its unique creatures. Each tour offers different levels of pace, price, and group size, so you can pick what matches your travel style best.
1. From Ljubljana: Postojna Cave & Predjama Castle Guided Trip
At number one, this comprehensive 5-hour guided day trip from Ljubljana combines two of Slovenia’s top attractions. The tour includes a visit to the world-famous Postojna Cave, where you’ll walk through winding caverns filled with stalactites, stalagmites, and the cave’s resident baby olms. Then, you’ll explore the picturesque Predjama Castle, built into a cliff face, which adds a touch of medieval drama.
What makes this tour stand out is the detailed guidance, personalized service (reviews mention a “warm, friendly” guide), and the seamless combination of underground exploration with a castle visit. The cave train ride inside Postojna ensures a comfortable journey through the underground tunnels, making it accessible for most travelers. The highlight for many is the chance to see the “dragon fish” vivarium, a rare species unique to these caves.
Priced at $72 per person, it’s an excellent value for a well-rounded experience. The reviews praise the knowledgeable guide and the ability to beat crowds by arriving early. Perfect for those wanting a balanced mix of adventure and history, with plenty of photo opportunities.
Bottom Line: This tour offers a personalized, well-organized experience of Postojna and Predjama that fits comfortably into half a day.
2. Ljubljana: Postojna cave & Predjama castle small group tour
Number two on our list is a small group tour (up to 8 people), making for a more intimate experience. Starting from Ljubljana’s Dalmatinova ulica, this 5-hour tour visits both the amazing Postojna Cave and the dramatic Predjama Castle. The small group size means more personalized attention and flexibility to ask questions. Guides are known for their enthusiasm and local knowledge, making the ride and the tour itself more engaging.
This tour is ideal if you prefer a more relaxed, conversational approach, with the convenience of hotel pickup and drop-off. You’ll enjoy a guided tour of the caves, including the inside train ride, and spend time taking photos at the castle. The reviews highlight the guide’s bubbly personality and the interesting stories about Slovenia’s landmarks.
Priced slightly higher at $79, this tour justifies the cost with its small group feel and expert guidance. It’s best suited for travelers who want a deeper connection and less crowding.
Bottom Line: Small group tour offering a personal touch and excellent guide insight, perfect for those who want to ask questions and get detailed stories.
3. From Koper: 5-Hour Tour to Postojna Cave & Predjama Castle
Coming in at number three, this Koper-based tour offers a timed visit to Postojna Cave and Predjama Castle in about five hours. For just $79, it’s a solid way to combine underground marvels with stunning medieval architecture. The tour includes a guided exploration of Postojna Cave, where you’ll ride the electric train through one of the largest cave networks in Slovenia. Then, you’ll climb to the unique Predjama Castle, perched dramatically on a cliff, an iconic photo stop.
What makes this tour appealing is its efficient schedule and the opportunity to see both attractions in a single manageable trip. Several reviews mention the professional guides and beautiful scenery along the way. The cave’s baby olm salamanders are a special highlight, as they’re rare and can only be found in select locations.
While it’s a shorter tour, it offers a comprehensive snapshot of the region. It’s best suited for travelers based in Koper or those with limited time but eager to see Slovenia’s highlights.
Bottom Line: A focused, value-packed tour for those wanting to visit the main sights without spending a full day away.
4. Postojna cave and Bled lake day tour from Ljubljana
Number four is a full-day adventure that combines Slovenia’s famous Postojna Cave with the breathtaking Lake Bled. For $170, this 6-hour tour is perfect if you want to see two of Slovenia’s most iconic sites in one day, without the hassle of planning multiple trips. The tour includes a visit to the best viewpoint of Lake Bled, where you can take iconic photos of the church on the island.
What sets this trip apart is the combination of underground exploration with a scenic lakeside experience. You’ll learn about Slovenia’s landscape and history while enjoying the guided tour of the caves and lakes. Reviews mention how well-organized the trip is and the chance to take a relaxing boat ride on Lake Bled afterward.
This tour is ideal for travelers with a day to spare who want a rundown of Slovenia’s natural wonders. The price reflects the full-day experience, but it’s excellent value given the attractions included.
Bottom Line: A convenient, all-in-one day trip for visitors eager to experience Slovenia’s underground and lakeside beauty.
5. From Zagreb: Postojna Cave, Lake Bled, Ljubljana Day Trip
Travelers coming from Zagreb don’t miss number five, a long but rewarding 11-hour day trip. For $613, this trip covers Postojna Cave, Lake Bled, and the charming streets of Ljubljana. The itinerary allows plenty of time at each stop, making it ideal if you want to maximize your sightseeing and not feel rushed.
The highlight is the chance to explore Postojna’s tunnels, then enjoy the famous Bled island and castle, plus a tour of Ljubljana’s historic center. The reviews note that the trip provides insightful commentary and a comfortable coach ride. It’s perfect if you’re combining your Slovenian visit with other destinations or want a guided, stress-free experience.
While pricier, the inclusion of multiple major attractions offers excellent value for those seeking a comprehensive Slovenian experience in one day. Expect long hours, but also rich memories.
Bottom Line: Best for travelers with a full day and a desire to see the highlights of Slovenia from multiple angles.
6. From Ljubljana: Postojna Cave Day Trip
Number six is a straightforward 2-hour trip focusing solely on the Postojna Cave. For $102, it offers a private round-trip transportation with an informative guided tour inside the cave. It’s a no-fuss, efficient option for those who want to experience Slovenia’s second-longest cave system without extra stops.
The train ride inside the cave ensures a comfortable visit, and the tour highlights the spectacular formations and endangered olms. Customers appreciate the private transfer, which removes the hassle of public transportation or self-driving. The tour is suitable for all fitness levels, with manageable walking and sightseeing.
While it doesn’t include Predjama Castle, this trip is a good choice for travelers limited on time or preferring a more intimate visit. The reviews commend the knowledgeable guide and the easy logistics.
Bottom Line: Perfect for quick, private exploration of Postojna Cave with a focus on comfort and efficiency.
7. Ljubljana to Postojna Cave, Predjama Castle and Postojna park
Number seven offers a 7-hour journey that includes a visit to Postojna Cave, Predjama Castle, and the Postojna Cave Park. It’s a slightly longer day, suitable for travelers who want to combine underground exploration with outdoor walking. The tour emphasizes exploring the caves and the castle with some time to relax at the park.
The reviews indicate the trip is well-organized, though the small number of reviews suggests it’s less popular than others. Still, it provides a comprehensive look at the region, with an emphasis on the beautiful scenery around the caves and castle. The guided walk through the park adds a different dimension, making it appealing for families or outdoor enthusiasts.
This tour offers a more relaxed pace without rushing through the main sites, making it good for those who want a mix of indoors and outdoors.
Bottom Line: A balanced tour for those who want to enjoy both caves and castle while including some outdoor time.
$119 per person
8. From Trieste: Postojna Cave & Predjama Castle Tour
Number eight is a relaxed 6-hour private tour from Trieste that covers Postojna Cave and Predjama Castle at a comfortable pace. It features scenic drives, cave train rides, and a guided walk through the underground chambers.
The tour highlights include local guides sharing tips and stories beyond standard descriptions, and the small group/private format ensures a tailored experience. This is ideal for couples or families wanting a stress-free day without rush, with the convenience of pickup from Trieste. Many reviews underline the smooth organization and personalized attention.
The cost ($200) reflects the private nature and flexibility, making it a good choice if you prefer customized sightseeing over a larger group tour. It’s best suited for travelers who appreciate a quiet, paced exploration.
Bottom Line: A premium, private experience of Slovenia’s top sights, perfect for those seeking comfort and personalized insights.
$200 per person
9. Postojna cave day tour from Ljubljana
Finally, number nine is a 4-hour guided visit focusing on Postojna Cave. For $114, it’s a mid-length tour that includes a train ride and an in-depth look at the cave’s spectacular formations.
This tour is ideal if you want a balanced experience — enough time to explore but not too long or costly. It’s suited for travelers with limited time but still eager to see the most famous Slovenian cave. The reviews mention the old cave formations and how the train ride makes the tour comfortable.
The guided aspect ensures you understand the significance of the formations, and the price is reasonable given the experience. It’s a straightforward choice for those who want to see the cave without extra stops or complications.
Bottom Line: An efficient, well-organized tour for cave lovers short on time.
$114 per person
How to Choose Your Postojna Tour
Picking the right tour depends on your schedule, budget, and interests. If you want a personalized experience and don’t mind splurging, the private tour from Trieste offers tailored service. For quick visits, the Ljubljana day trip or the shorter guided options are ideal. Those with a full day to spare should consider the Lake Bled combo tour or the full Zagreb trip.
If you’re interested in more outdoor time, the Ljubljana to Postojna & Predjama Park provides a good balance. For families or groups wanting comfort, the small group tour can be your best bet. And if you’re coming from nearby cities like Trieste, the private from Trieste tour offers a relaxed, insider experience.
Remember to check availability early, especially during peak seasons, and consider booking in advance to secure your preferred time slot. Each tour offers a distinct way to experience Postojna’s wonders, so choose based on what appeals most: speed, depth, or comfort.
Final Thoughts
In Postojna, you’re spoiled for choice — from guided day trips to private explorations, and from caves with underground trains to castle visits. For a quick overview, the From Ljubljana: Postojna Cave & Predjama Castle Guided Trip provides a balanced, highly reviewed introduction, while the small group tour ensures a more personal experience. If you want to see more of Slovenia’s highlights in one day, the Zagreb trip is hard to beat.
For those seeking comfort and tailored service, the private tour from Trieste is outstanding. Meanwhile, budget-conscious travelers will appreciate the efficient private visit or the shorter guided options. Whatever your style, Postojna’s incredible caves and iconic castle are waiting — just book early to secure your spot.
Enjoy your visit to Postojna — it’s a place where nature’s artistry and history come together in a way that leaves a lasting impression. Happy exploring!