Slovenia, caves, lakes and Alps in a small space.

Which Slovenia to choose?

Slovenia fits into a long weekend by road: from the Julian Alps to the Adriatic Sea is less than three hours. In the middle is Ljubljana, a small capital you can explore on foot. To the north-west, the Alps and the mountain lakes. And to the south-west, on the way to the coast, the karst: a limestone plateau so full of caves and rivers that vanish underground that its name is used all over the world for this kind of landscape.

• If caves appeal to you, the visit is Postojna Cave and Predjama Castle, an hour from Ljubljana. An electric train takes you into a cave with 24 km of galleries; the rest of the route, about 1.5 km, is on foot with a guide. 9 km away, Predjama Castle seals the mouth of another cave halfway up a 123-metre wall. You can see them together in a day.
• If you are travelling with children, Postojna works very well: the train appeals to all ages, the visit lasts an hour and a half and, next to the entrance, the Proteus Vivarium shows the animals that live in the dark, such as the olm, the blind amphibian of the caves.
• If you want something wilder, the Škocjan Caves, about 30 km away, are a World Heritage Site: an underground canyon with a bridge over the river tens of metres up. You visit with a guide.

The caves combine well with two nights in Ljubljana and, if you have more days, with the lakes of the Julian Alps or the coast.

How do you get there from Spain?

By plane. Ljubljana airport has few flights from Spain: Vueling flies from Barcelona and Iberia has a seasonal route from Madrid, in summer. It is about two hours' flying. The alternative with more flights is to land at Trieste or Venice, in Italy: from Trieste, Postojna is a little over 50 km by motorway. Zagreb, in Croatia, is another option.

Paperwork. Slovenia is in the European Union and in Schengen: a valid Spanish national ID card is enough. The currency is the euro and the European Health Insurance Card covers urgent care.

How do you get around?

A car is the most practical way to see several areas in a few days. To drive on Slovenian motorways and expressways you need the e-vignette, electronic and linked to the number plate: in 2026, the weekly one for a car costs €16 and the monthly one €32. Buy it only on DARS's official website before entering the first motorway, with the plate and country spelled correctly. If you hire the car outside Slovenia, ask whether it comes with one.

Without a car, the train from Ljubljana to Koper stops at Postojna, and from the station you reach the cave with a good walk or by taxi. In summer there is a shuttle bus between the cave and Predjama Castle for those with the combined ticket. Visit Ljubljana and other agencies sell day trips from the capital.

When to go and what it costs

May, June and September are the best months: good temperatures, long days and fewer groups. In July and August everything runs at full capacity, but Postojna Cave fills up by mid-morning. The caves open all year and inside it is always about 10 °C, so they are also good in winter. In December, Postojna stages a living nativity scene inside the cave.

The budget is medium, a little cheaper than Austria or Italy. Cave tickets are the most expensive thing in the area: Postojna Cave costs from €34, and the combined ticket with Predjama works out cheaper than buying them separately.