Dec – Feb
Short daylight
The cave does not care, but the castle part of the day does. The five-and-a-half-hour listings from the capital sit inside the light; the thirteen-hour ones from Zagreb start and finish in the dark.
With Predjama Castle
Postojna Cave and Predjama Castle tour: why the two are almost always sold as one
Thirteen of the sixteen listings on this site take both places on the same day, so a Postojna cave and Predjama castle tour is not a special package — it is the normal product in this niche. The reason is geography, not marketing. The castle stands nine kilometres from the cave, which is one short hop for a vehicle that has already driven an hour to get there. Once the transport has made that journey, adding the castle costs the day a fraction of the time it costs to reach the cave in the first place, and that is why a Postojna cave and Predjama castle tour fits inside five and a half hours from the capital while a version that adds Lake Bled needs ten or more. The lowest fare of the thirteen is $74; the most reviewed is $130 with 2,846 reviews at 4.8.
The pairing, at a glance
- How many listings take both
- Thirteen of sixteenonly three on this site leave the castle out of the day
- How far apart they are
- Nine kilometresa short hop for transport that has already driven an hour from the capital
- The shortest day with both
- 5.5 hours$79 and $121, from the capital
- The lowest fare with both
- $74 · 6 hoursa guided cave visit and a historic castle tour, rated 4.6 from 212 reviews
- The most reviewed with both
- $130 · 4.82,846 reviews; the description calls both places precious jewels of Slovenia
- Departure cities
- Ljubljana, Trieste, Zagrebthe pair is sold from all three; the days from Zagreb run 12 to 13 hours
- What adding Lake Bled costs
- Ten hours or morea third sight roughly doubles the day, which is the real trade-off here
- The three that skip the castle
- Bled instead$192, $302 and $729
- Cancellation
- Free cancellationit applies on every tour listed on this site
Quick answer
The short answer. Book a Postojna cave and Predjama castle tour if you want both, which is what almost everyone here does: thirteen of sixteen listings include the pair. From the capital, $79 does it in five and a half hours with a private transfer for up to eight, rated 4.9, and $121 does it in the same time with tickets included. $74 is the lowest fare here at six hours, and $130 is the most reviewed on the site at 4.8 from 2,846 reviews. From Trieste, $137 covers both in six hours; from Zagreb, $134 takes twelve and is rated 4.9. Free cancellation applies on every tour on this site.
The one thing to understand
Nine kilometres is why this pairing exists
Two attractions get sold together for one of two reasons: because they belong to the same story, or because they are close enough that separating them would waste a vehicle. Here it is emphatically the second, and knowing that makes the fares on this page read very differently.
Do the arithmetic the operators did. From the Slovenian capital the drive is about an hour each way. Two hours of road, and the cave visit itself, is already most of a half day. The castle is nine kilometres further on. Adding it costs minutes of driving, not hours — which is why a Postojna cave and Predjama castle tour comes in at five and a half hours in $79 and $121, barely longer than a cave-only trip would be.
Compare that with what a third sight costs. Lake Bled is not nine kilometres away, and the listings show it: $131 and $118 run ten hours, $127 eleven, $164 and $192 eleven and a half. A third stop roughly doubles the day. A Postojna cave and Predjama castle tour is the version of this trip where every extra hour goes into sightseeing rather than into a windscreen.
What the operators call the second stop. The descriptions are not shy about it. $130 calls the castle mysterious and medieval and says both places rank among the most precious jewels of Slovenia. $137 calls it the only preserved cave castle in Europe. $118 calls it the world's largest cave castle. $121 says it is built into a cave. Those first two claims do not quite agree with each other, and we report them as operators' words rather than settling a dispute we have no data to settle.
Thirteen listings, three departure cities
Every Postojna cave and Predjama castle tour on this site, in one table
Ordered from the shortest day to the longest. Fares, ratings and lengths are printed on the listing pages; the departure city is the one the description names.
| The listing | Leaves from | Fare | Rating | Length |
|---|---|---|---|---|
| A private transfer for up to 8 | Ljubljana | $79 | 4.9 · 490 | 5.5 hours |
| The half day with tickets included | Ljubljana | $121 | 4.8 · 199 | 5.5 hours |
| The guided trip, lowest fare here | Ljubljana | $74 | 4.6 · 212 | 6 hours |
| Tickets and a tour of both | Ljubljana | $130 | 4.8 · 2,846 | 6 hours |
| The cave and the cave castle | From Trieste | $137 | 4.8 · 545 | 6 hours |
| The day that adds a boat tour | Ljubljana | $228 | 3.8 · 4 | 7 hours |
| Three sights with a pletna boat | Ljubljana | $131 | 4.9 · 288 | 10 hours |
| The small-group day with Piran | Ljubljana | $118 | 4.9 · 459 | 10 hours |
| Bled, the karst and the legend | Not named | $182 | 4.9 · 64 | 10.5 hours |
| Three sights, small groups up to 8 | Ljubljana | $127 | 4.9 · 178 | 11 hours |
| Cave, castle and Lake Bled in a group | Ljubljana | $164 | 4.7 · 228 | 11.5 hours |
| Ljubljana, the cave and the castle | Zagreb | $134 | 4.9 · 74 | 12 hours |
| The capital, the cave and the castle | Zagreb | $158 | 4.6 · 85 | 13 hours |
What the pairing gives you
Two entirely different kinds of place, on one tank of fuel
The practical argument for a Postojna cave and Predjama castle tour is efficiency. The more interesting argument is contrast. You spend part of the day below ground at about 10 °C among limestone formations, and part of it standing in a medieval building wedged into a cliff. Those are two completely different experiences that happen to share the same karst landscape and the same nine-kilometre stretch of road.
The half day is the sweet spot for most trips. If Slovenia is a week and the cave is one item on the list, $79 at five and a half hours with a private transfer for up to eight and a 4.9 rating leaves you an afternoon in the capital. So does $121 at the same length. Neither asks you to write off a whole day.
The six-hour listings are where the evidence is. $130 holds 2,846 of the 6,561 reviews on this site at 4.8, and $74 adds another 212 at 4.6 as the lowest fare here. If you want the Postojna cave and Predjama castle tour that the largest number of people have already been on and rated, it is the first of those two.
Coming from further away changes the maths, not the pairing. $137 does both places in six hours from Italy, rated 4.8 from 545 reviews. From Croatia the same pair becomes a serious day: $134 runs twelve hours and is rated 4.9, and $158 runs thirteen and adds Ljubljana itself with tickets included. Those are long days by any measure, and the listings say so in their own durations.
The highest fare here buys a different product. $228 spends seven hours on the cave, the castle and a boat tour, and it has four reviews so far at 3.8 — a number too small to read much into in either direction. If a boat is part of what you want from the day, it is the only listing on this site that includes one.
Before you book
Seven things worth knowing about taking both places in one day
All of it off the listing pages and the plain distance between the two sites. No promises here about queues, crowds or weather.
- Nine kilometres is the whole reason
The castle is that far from the cave. A Postojna cave and Predjama castle tour therefore costs only minutes more driving than a cave-only day would, which is why thirteen of sixteen listings include it.
- The pair fits a half day; three sights do not
Five and a half to six hours for the two. Ten to eleven and a half once Lake Bled or Piran joins the itinerary.
- Two of the operators' claims about the castle disagree
One listing calls it the only preserved cave castle in Europe; another calls it the world's largest cave castle. We quote both as operators' wording rather than picking a winner.
- Dress for the cave, not for the castle
Below ground it is about 10 °C in every month. The castle part of the day is at whatever temperature the surface is doing, and nobody can tell you that in advance.
- Three listings here leave the castle out
$192 pairs the cave with Lake Bled instead, and the two private or near-private days from Zagreb, $302 and $729, build the day around Bled and the capital.
- The longer and dearer days buy a second landscape
$164 at 11.5 hours and $158 at thirteen cost more because they add the lake or the capital to the pair. If you only have one day in the country, that is a strong reason to take one of them rather than the half day.
- Every listing here carries free cancellation
The window is stated on the listing page, and the listing page governs. Read it twice before booking a thirteen-hour day.
Through the year
When taking both places in one day works best
Five bars, one for each part of the year. The cave is unchanged at about 10 °C in every month; what the bars measure is how much daylight is left for the castle and the road between them.
Mar – Apr
Light returns
One of the two best windows for taking both places: enough daylight for the drive, the cave and the cliff.
May – Jun
Long evenings
Every length on this page works, including the twelve-hour day from Zagreb.
Jul – Aug
Holiday weeks
The hour below ground is the coolest of the day. These are the European holiday weeks, so the small-group listings capped at eight are worth booking well ahead.
Sep – Oct
The other best window
Comfortable hours above ground and unchanged conditions below, with every departure city on this page workable.
Every trip, current fare
Nine of the thirteen, priced by the hour
The half days, the six-hour trips from the capital and from Trieste, the twelve-hour day from Zagreb and the day with a boat tour, with what each includes and its cost per hour.
| Tour | Length | Price | What is included | Cost per hour | Rating |
|---|---|---|---|---|---|
| From Ljubljana: Postojna Cave & Predjama Castle Guided TripThe lowest fare on this site | 6 h | $74 | A guided cave visit and a historic castle tour | $12.33 | 4.6 · 212 |
| Ljubljana: Postojna Cave and Predjama Castle TourRated 4.9, private transfer | 5.5 h | $79 | Transfer for up to 8 with an English driver-guide | $14.36 | 4.9 · 490 |
| From Ljubljana: Postojna Cave, Predjama Castle, & Piran TourRated 4.9, max 8 guests | 10 h | $118 | Cave, castle and Piran on the Adriatic, max 8 guests | $11.80 | 4.9 · 459 |
| Postojna Cave & Predjama Castle half-day – tickets includedHalf a day, rated 4.8 | 5.5 h | $121 | Stalactites and stalagmites, the cave castle, tickets in | $22.00 | 4.8 · 199 |
| Ljubljana: Postojna Cave & Predjama Castle Tickets and TourThe most-reviewed tour here | 6 h | $130 | Cave and castle tickets, and a guided tour of both | $21.67 | 4.8 · 2,846 |
| From Zagreb: Ljubljana, Postojna Cave & Predjama Castle TourRated 4.9, from Zagreb | 12 h | $134 | Ljubljana, the cave and the striking castle | $11.17 | 4.9 · 74 |
| From Trieste: Postojna Cave & Predjama CastleThe one leaving Trieste | 6 h | $137 | The cave and the cave castle, leaving from Trieste | $22.83 | 4.8 · 545 |
| From Ljubljana: Postojna Cave, Predjama Castle and Lake BledA group day of 11.5 hours | 11.5 h | $164 | The underground passages and Lake Bled, in a group | $14.26 | 4.7 · 228 |
| Ljubljana: Postojna Cave, Predjama Castle & Boat TourFour reviews so far | 7 h | $228 | The cave, the castle and a boat tour in one day | $32.57 | 3.8 · 4 |
Want the castle on its own terms? The castle page collects everything the operators say about the building in the cliff.
See the castle→Book direct
Nine bookings that take both places in one day
Two half days from the capital, the six-hour trips from the capital and from Trieste, the twelve-hour day from Zagreb, the group day with Lake Bled and the day with a boat tour. Every Postojna cave and Predjama castle tour shape this niche sells, from the lowest fare here upwards.
Lowest price here212 reviews
6 hFrom Ljubljana: Postojna Cave & Predjama Castle Guided Trip
★ 4.6 · 212 reviews
- Six hours, at Postojna Cave and Predjama Castle
- Small group
- Cheapest here
- Free cancellation
$74$12.33 / hour
Check availability→ 
Rated 4.9490 reviews
5.5 hLjubljana: Postojna Cave and Predjama Castle Tour
★ 4.9 · 490 reviews
- 5.5 hours, at Postojna Cave and Predjama Castle
- Small group
- 1 hour
- Free cancellation
$79$14.36 / hour
Check availability→ 
Rated 4.9459 reviews
10 hFrom Ljubljana: Postojna Cave, Predjama Castle, & Piran Tour
★ 4.9 · 459 reviews
- Ten hours, at Postojna Cave and Predjama Castle
- Small group
- 1 hour
- Free cancellation
$118$11.80 / hour
Check availability→ 
5.5 h5.5 h
5.5 hPostojna Cave & Predjama Castle half-day – tickets included
★ 4.8 · 199 reviews
- Five and a half hours, at Postojna Cave and Predjama Castle
- Small group
- 1 hour
- Free cancellation
$121$22.00 / hour
Check availability→ 
6 h2,846 reviews
6 hLjubljana: Postojna Cave & Predjama Castle Tickets and Tour
★ 4.8 · 2,846 reviews
- Six hours, at Postojna Cave and Predjama Castle
- Small group
- Most booked
- Free cancellation
$130$21.67 / hour
Check availability→ 
Rated 4.912 h
12 hFrom Zagreb: Ljubljana, Postojna Cave & Predjama Castle Tour
★ 4.9 · 74 reviews
- Twelve hours, to Ljubljana and Postojna Cave
- Small group
- 1 hour
- Free cancellation
$134$11.17 / hour
Check availability→ 
6 h545 reviews
6 hFrom Trieste: Postojna Cave & Predjama Castle
★ 4.8 · 545 reviews
- Six hours, to Postojna Cave and Predjama Castle
- Small group
- 1 hour
- Free cancellation
$137$22.83 / hour
Check availability→ 
11.5 h228 reviews
11.5 hFrom Ljubljana: Postojna Cave, Predjama Castle and Lake Bled
★ 4.7 · 228 reviews
- 11 and a half hours, to Postojna Cave and Lake Bled
- Small group
- 1 hour
- Free cancellation
$164$14.26 / hour
Check availability→ 
7 h7 h
7 hLjubljana: Postojna Cave, Predjama Castle & Boat Tour
★ 3.8 · 4 reviews
- Seven hours, at Postojna Cave and Predjama Castle
- Small group
- 1 hour
- Free cancellation
$228$32.57 / hour
Check availability→ Common questions
The pairing, answered
Why is a Postojna cave and Predjama castle tour sold as one thing?
Because the castle is nine kilometres from the cave. A vehicle that has already driven about an hour from the capital reaches the second stop in minutes, so thirteen of the sixteen listings on this site include both.
How long does it take?
From the capital, five and a half to six hours: $79 and $121 at 5.5, $74 and $130 at six. From Trieste, six hours. From Zagreb, twelve to thirteen.
Which one is cheapest?
$74, a six-hour guided trip with a cave visit and a historic castle tour, rated 4.6 from 212 reviews. It is the lowest fare on this site.
Which one has the most reviews?
$130, with 2,846 reviews at 4.8. Its description calls the cave and the castle two of the most precious jewels of Slovenia.
Can I do both and Lake Bled in one day?
Yes, but it becomes a full day out. $131 and $127 run ten and eleven hours, and $164 runs eleven and a half.
Is there a Postojna cave and Predjama castle tour from outside Slovenia?
Two countries' worth. $137 covers both in six hours from Italy, and from Croatia $134 takes twelve hours at a 4.9 rating while $158 takes thirteen and adds Ljubljana.
What should I wear?
A jacket for the cave in any month, because it stays close to 10 °C below ground all year, and shoes you can walk a castle in. The surface weather is nobody's to promise.
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