Quick Answer
Postojna Cave is an easy Ljubljana day trip. Public transport can work well for the cave alone, while a car or guided tour is often smoother if you also want Predjama Castle.
Before you travel, check current cave tour times and the connection between the cave and castle. The two sights pair naturally, but the logistics are not the same as visiting one city-center attraction.
Tickets, Tour Times, And The Cave Train
Adult prices and times from the official ticket site and timetable at the last check. The visit starts with the electric cave train, which carries you 3.5 km into the system before the guided walk through the halls; the temperature inside is 10°C whatever the weather outside.
- Cave ticket
- €34.90 adults (2026)
- Cave plus Predjama Castle
- €49.90 adults (2026); castle alone €24
- Tour times
- Hourly from 09:00 to 18:00, with extra 10:30 and 15:30 departures; arrive 30 minutes before
- Inside
- About 1h30: a cave-train ride in and out, then a 1.5 km guided walk; a constant 10°C
- Getting there
- Bus or train to Postojna, then a 15-minute walk to the Cave Park
Transport Options
Simple public transport
Bus
Usually the easiest car-free choice if times line up. Check whether your stop is convenient for the cave entrance.
Rail travelers
Train
Works when schedules fit, but check the final walk or local connection to the cave area.
Cave plus castle
Car
Best for combining Postojna Cave with Predjama Castle and avoiding awkward transfer timing.
No logistics
Guided tour
Useful if you want transport, entrance coordination, and the castle add-on handled in one package.
Postojna Or Škocjan?
Choose Škocjan for a more dramatic UNESCO underground-canyon experience. Choose Postojna if you want easier logistics, a very common cave-and-castle day, or a simpler family-friendly plan.
Choose Škocjan if
- You want a UNESCO natural site and a wilder underground-canyon experience.
- You are comfortable planning around fixed guided-tour times.
- You can drive, join a tour, or handle a more deliberate public-transport plan.
Choose Postojna if
- You want the simplest cave day from Ljubljana.
- You are traveling with kids or visitors who prefer easier logistics.
- You want to combine the cave with Predjama Castle in a very common route.
Škocjan is 30 km further southwest and needs its own day; the Škocjan Caves guide covers the train to Divača and the tour times.
Timed-entry trip
Book The Day In The Right Order
The cave admission time is the fixed point. Transport that arrives in Postojna is only useful if it leaves enough time to reach the entrance, collect or show the ticket, and join the correct tour.
1. Pick the visit
Check the official calendar, language or tour format, ticket inclusions, age rules, and accessibility information for your date.
2. Match arrival
Work backward from the required check-in time. Include the route from the bus or rail stop to the visitor entrance, not only the ride from Ljubljana.
3. Add the castle
Only add Predjama after confirming the current connection and enough time at both sites. A combined ticket does not by itself solve transport between them.
4. Secure the return
Save the final realistic bus or train and an earlier fallback. If the public-transport margin is uncomfortable, compare a tour, transfer, or car.
Cave only
Use public transport if you want a simpler half-day or relaxed single-sight outing.
Cave plus castle
Use a car or tour if you want the most efficient combo with fewer transfer worries.
Family note
Bring layers, snacks, and buffer time. Underground tours can feel long if kids are tired or cold.
Cave-Only Is The Reliable Car-Free Plan
If you are using public transport, make Postojna Cave the non-negotiable part and treat the castle as an optional addition only when the live connection works. This keeps a delay or long gap from turning the whole day into transport management.
Pack For Underground Conditions
Bring a warm layer and stable footwear even when Ljubljana is hot. Check the operator's current mobility guidance and tour conditions if stairs, walking distance, darkness, enclosed spaces, or cold affect anyone in your group.