Slovenian Karst: caves and a cave castle
Ljubljana, the underground railway of Postojna, Predjama Castle and the Venetian port of Piran.
- Distance
- 124 km (77 mi)
- Driving
- 1 h 43 min
- Suggested days
- 2
- Stops
- 4
- Countries
- Slovenia
- Updated
- May 1, 2026
At a glance: 2-day road trip of about 124 km (77 mi) with 4 stops, from Ljubljana to Piran. About 1 h 43 min of driving in total.
More road trips in Slovenia · More road trips from Ljubljana
Route description
Leave Ljubljana, with its castle hill and dragon-guarded bridges over the Ljubljanica, south-west on the A1 motorway to Postojna. Slovenian motorways require an electronic vignette.
At Postojna Cave an electric train carries visitors deep into halls of stalactites, home of the blind olm. It is cool underground all year, so bring a warm layer.
Predjama Castle is a short drive away, built into the mouth of a cave halfway up a 123 m cliff. The limestone Karst plateau around it has small villages, stone walls and vineyards.
Continue to the coast and Piran, a Venetian port town with Tartini Square and narrow lanes on a small peninsula. The centre is closed to traffic, so use the car parks outside town and the shuttle bus.
Stop-by-stop itinerary
In driving order. Distances are estimates between consecutive stops.
- 1Start
Ljubljana
Slovenia - 248 km
Postojna Cave
NaturePostojna, SloveniaAn electric train runs deep into a cave system of stalactite halls, home of the blind olm.
- 39 km
Predjama Castle
HistoryPredjama, SloveniaA castle built into the mouth of a cave halfway up a 123 m cliff.
- 467 km
Piran
Slovenia
Suggested stages and overnight stops
2 days, split by driving time. Campsites from OpenStreetMap: check opening dates before you go.
- Day 1: Ljubljana → Predjama Castle · 57 km · 0 h 47 minOn the way: Postojna Cave.Overnight nearby, for example: Pivka jama (6 km); Camp Mirjam (8 km).
- Day 2: Predjama Castle → Piran · 67 km · 0 h 56 minOvernight nearby, for example: Camp Lucija (4 km); Camping Kanegra FKK (5 km).
Best time to go
The most pleasant months are usually May–June and August–September. Still fine, with some compromises, in July and October. Cold, short days in December–February. July and August are the busiest months: book campsites early.
Estimate from long-term temperature averages, terrain and pass seasons
Practical notes for the road
- Slovenia: Vignette needed for motorways. Buy the e-vignette online before you drive on motorways. Motorway limit for cars: 130 km/h.
Road rules and fees change. Check official sources before you travel.
FAQs
How long is Slovenian Karst: caves and a cave castle?
2-day road trip of about 124 km (77 mi) with 4 stops, from Ljubljana to Piran. About 1 h 43 min of driving in total.
How many days do you need for Slovenian Karst: caves and a cave castle?
We suggest 2 days: about 1 h 43 min of driving, which leaves time for the stops.
Where does Slovenian Karst: caves and a cave castle start and end?
It starts in Ljubljana and ends in Piran.
Which countries does Slovenian Karst: caves and a cave castle pass through?
Slovenia.
Where can you camp along Slovenian Karst: caves and a cave castle?
OpenStreetMap lists 69 campsites and motorhome stopovers within 20 km of the stops on this route. For example: Ljubljana Resort Hotel & Camp, Camping & Camper Stop near Ljubljana and Camp Smlednik.
When is the best time for Slovenian Karst: caves and a cave castle?
The most pleasant months are usually May–June and August–September. Still fine, with some compromises, in July and October. (Estimate from long-term temperature averages, terrain and pass seasons)
