Experiences · Boat Tours
A Blue Cave boat tour is the bay's most popular half-day on the water — the glowing sea cave plus Our Lady of the Rocks, the submarine tunnels and Mamula. Here's who should book it, the typical route, the timing and sea caveats that make or break the day, and how it works if you're off a cruise ship.
Quick answer: for most visitors, a Blue Cave tour from Kotor is worth it — but as part of a wider bay loop, not as a standalone sight. The cave itself is a short stop, a sea cavern where light bouncing off a white seabed turns the water an electric, glowing blue. What makes the day is everything strung around it: Our Lady of the Rocks, the WWII submarine tunnels, fortress-island Mamula, and a swim in open Adriatic water. Expect three to five hours and roughly €25–€45 on a group boat. The one big caveat: it lives and dies by the sea. On a calm, sunny morning it's superb; in wind or swell the cave can be skipped entirely.
The honest take. The Blue Cave is genuinely lovely but it's a 10–15 minute stop, not a destination. Book the tour for the whole package — bay islands, tunnels, Mamula and a swim — and treat the cave as the highlight bead on the string, not the whole necklace. And always check the morning forecast before you commit.
| If you… | Worth it? | Why |
|---|---|---|
| Want one big day on the water | Yes | You see the cave, the islands, the tunnels and Mamula in one trip. |
| Love swimming and snorkelling | Yes | The swim stop in glowing water is the best part for many. |
| Only care about Perast & the island church | Maybe | A shorter Perast / Our Lady of the Rocks trip may suit you better. |
| Get seasick or dislike open water | Caution | The open-sea leg to the cave is choppier than the sheltered bay. |
| Have a short cruise port call | Risky | 3–5 hours plus weather risk leaves little all-aboard buffer. |
| Are travelling with very young kids | Maybe | Doable on a calm day, but the long boat time can be a lot for toddlers. |
The Blue Cave (Plava Špilja) sits on the open-sea side of the Luštica peninsula, near the mouth of the Bay of Kotor. From Kotor's Old Town waterfront it's roughly 45–60 minutes by fast boat, which is why Blue Cave trips from Kotor are half- or full-day affairs rather than quick hops. Tours from Herceg Novi or Tivat have a shorter run to the cave, so if you're based out near the mouth of the bay you'll spend less time in transit.
Book a Blue Cave & bay boat tour
The classic half-day from Kotor: Our Lady of the Rocks, the submarine tunnels, Mamula and the Blue Cave with a swim stop. Group boats are cheap and social; reserve a morning slot in summer.
Most Blue Cave tours from Kotor follow a similar loop down the bay and out to the open sea. The exact order and which stops are included vary by operator and sea conditions, but you'll usually get most of these:
| Stop | What it is | Typical time |
|---|---|---|
| Our Lady of the Rocks | The man-made island church off Perast, often with a short visit ashore. | 20–30 min |
| Perast (some tours) | Baroque waterfront village; sometimes a photo pass, sometimes a short stop. | 0–30 min |
| Submarine tunnels | Cold-War-era tunnels carved into the cliff to hide Yugoslav navy boats. | 10–15 min |
| Mamula island | A 19th-century fortress island at the mouth of the bay (now a hotel). | Pass / photo |
| Blue Cave | The glowing sea cave, with a swim stop inside or just outside. | 10–20 min |
For a fuller comparison of every bay tour type — group vs private, half- vs full-day, Blue-Cave-or-not — see our Bay of Kotor boat tours guide.
The cave glows brightest when the sun is high and the sea is calm, so a late-morning to early-afternoon slot is ideal for the colour. But for crowds the calculus flips: the first morning departures beat the cruise-day rush at Our Lady of the Rocks and the queue of boats jostling at the cave mouth. Our rule of thumb: book a morning tour for fewer crowds and a calmer sea, accepting the light is best around midday. Peak season (July–August) means more boats everywhere; June and September give you warm water with thinner crowds.
This is the part people underestimate. The cave is on the open-sea side of Luštica, exposed to wind and swell that the sheltered inner bay never feels. When the sea is up:
Check the morning forecast, ask the operator what happens if the cave is unreachable, and favour a flexible or free-cancellation ticket so a windy day doesn't cost you. Calm mornings are far more common than rough ones in summer, but it pays to have the option.
You want one memorable day on the water, you like to swim, and you'd rather see the cave, the islands and the tunnels together than tick off a single sight.
You're a confident swimmer or snorkeller — the glowing swim stop is the highlight, and a private speedboat lets you linger and dodge the crowds.
You get seasick, dislike open water, or are travelling with toddlers who won't enjoy several hours afloat. A shorter Perast trip may suit you better.
You're a cruise passenger on a short port call. The length plus weather risk makes the all-aboard buffer tight — read the cruise section below first.
Sometimes — but plan it carefully. A full Blue Cave loop is three to five hours, and the weather can stretch or shorten it without warning. That's fine on a long port call, but risky on a short one. If you're set on the cave, book a small private speedboat from a Kotor or Tivat operator who knows the all-aboard time and can guarantee your return, and build in at least an hour of buffer. If your day is short or you want certainty, swap to a shorter Perast and Our Lady of the Rocks trip instead — you'll still get the bay's signature island church without betting your sail-away on the open sea. Our cruise-crowd guide has the full timing playbook.
Cruise day? Lock in a private boat with a guaranteed return
A small private speedboat lets you set the departure, skip the queues and be back well before all-aboard. Filter for free cancellation in case the ship's schedule shifts.
| Alternative | Best for | Why choose it |
|---|---|---|
| Perast & Our Lady of the Rocks trip | Short on time, cruise days, no open water | Shorter, sheltered and reliable — the bay's signature church without the open-sea leg. |
| Full-day bay loop | One big day, want everything | Adds beach and lunch stops to the cave-and-islands route. |
| Private speedboat charter | Families, photographers, tight schedules | Set your own pace, swim stops and timing; skip the cave queue. |
| Self-guided Perast by bus/boat | Independent, budget travellers | Skip tours entirely and take the local boat taxi to the island. |
Weighing Perast specifically? See our things-to-do guide for how the island church, the village and the bay tours fit together.
Related guide
Want the sea day without the shared speedboat?
A private Adriatic day charter gives you the Blue Cave, Mamula and a swim stop on your own schedule — no group of strangers, no fixed turnaround. Our sister site Adriatic Yacht Guide compares crewed day charters and longer yacht weeks across the Bay of Kotor and Croatia-to-Montenegro routes.
Ready to book your bay day?
Compare Blue Cave and bay boat tours across operators, check what's included and reserve a morning slot with free cancellation.
For most visitors, yes — as part of a wider bay loop. You get the glowing cave plus Our Lady of the Rocks, the submarine tunnels and Mamula, with a swim stop, usually in three to five hours for €25–€45 on a group boat. It's best on a calm, sunny morning; if the sea is rough the cave may be skipped, so book flexible and check the forecast.
It's on the open-sea side of the Luštica peninsula, near the mouth of the Bay of Kotor — roughly 45–60 minutes by fast boat from Kotor's Old Town. That distance is why Blue Cave trips from Kotor are half- or full-day tours. From Herceg Novi or Tivat the run is shorter.
Yes, most tours stop for a swim inside or just outside the cave, where the water glows blue from light off the white seabed. Bring a swimsuit and towel; the water is cooler and deeper than the sheltered bay, and swimming inside depends on boat traffic and conditions.
Only with care. A full loop is three to five hours and depends on calm seas, so it suits long port calls with a buffer. On a short day, a shorter Perast and Our Lady of the Rocks trip is the safer choice, or a private speedboat with a guaranteed return.
Group boats are cheaper (~€25–€45pp), social and run a fixed route. A private speedboat costs more but lets you set the time and pace, skip the cave queue and tailor the swim stops — worth it for families, photographers or tight schedules.
