Blue Cave vs Blue Lagoon: Which Croatia Boat Trip Should You Pick?

26 August 2026 · 6 min read

The open sea off Biševo island from the air, on the route to the Blue Cave

One is a ten-hour speedboat day built around a glowing cave, the other a five-hour swim in shallow turquoise water. Same colour in the name, completely different days. Here is who should pick which, honestly.

Key takeaways

  • •The Blue Cave is a ten-hour €110 speedboat day built around a sight; the Blue Lagoon is a five-hour €60 trip built around a swim.
  • •The Blue Cave tour starts at 06:30, takes guests from age 8, and the cave entrance ticket is paid separately on site.
  • •The Blue Lagoon half day suits all ages, with shallow calm water, a 09:00 or 14:30 start and no entry fees.
  • •Anyone prone to seasickness should think hard before the Blue Cave, which crosses open sea at speed for much of ten hours.
  • •Families with children under 8 should take the lagoon or the Three Island Tour, since the Blue Cave tour starts at age 8.

They are completely different days, and choosing between them is easier than the similar names suggest. The Blue Cave is a sight: a glowing sea cave on Biševo at the end of a ten-hour speedboat day costing €110. The Blue Lagoon is a swim: a shallow turquoise channel near Trogir, five hours and €60. Which one you should pick depends on who is coming, how you handle open water and what you want a day on a boat to feel like.

One source of confusion is worth clearing up first: these are two different places at opposite ends of our map. The Blue Lagoon sits just west of Trogir. The Blue Cave is out on Biševo, past Vis, and its day happens to include a lagoon of its own at Budikovac, which is not the Blue Lagoon. Travellers mix the names up constantly, and it matters, because one is our gentlest trip and the other is our most demanding.

What each one actually is

The Blue Cave tour crosses open sea to the tiny island of Biševo, near Vis, where sunlight entering through a submerged opening fills a cavern with an electric blue glow, strongest around 11:00 to 12:00 on a calm, sunny day. The cave is only one stop: the day also visits Komiža, the dramatic Stiniva cove, the shallow Budikovac lagoon and Hvar town, on our fastest boat over our furthest route. What the day feels like hour by hour is in our Blue Cave guide.

The Blue Lagoon half-day tour stays close to home: a sheltered channel between Drvenik Veli and the Krknjaši islets, about 30 to 45 minutes from Trogir, with shallow, calm water clear enough to stand in and stare at. The five hours also fit in free time in the harbour village of Maslinica on Šolta and a second, quieter swim in Branač Bay.

The two days, side by side

Both prices include the skipper, fuel, marina fees, drinks on board and insurance, and the lagoon tour adds snorkelling gear. Cancellation is free up to 48 hours before the cave tour and 24 hours before the lagoon.

Pick the Blue Cave if

Pick the Blue Lagoon if

The honest caveats on both

The cave itself can close in wind or swell, and no operator anywhere can promise entry. If it closes before departure you can move to another day or take a full refund; if it closes while we are already out, the rest of the islands still run and the cave ticket, paid on site, is refunded. Seasickness is the other honest warning: if you know you are prone to it, take something before boarding, sit towards the middle and stay out in the air. Timing the trip for the best odds is covered in our best time to visit the Blue Cave guide.

The lagoon's caveat is company. Around midday in July and August it is the best-known swimming spot near Trogir and every operator goes there. The 14:30 afternoon departure arrives as the day boats are leaving, which is the quieter half of the day.

The middle option most people miss

If the real question is a full day out with children too young for the cave, the answer is often neither of the above. The Three Island Tour is a full day at €55 per adult, swims the same Blue Lagoon, and includes breakfast, a grilled lunch cooked on board and drinks, with children under 5 travelling free.

Can you do both?

Yes, on separate days, and plenty of guests do exactly that. Put the cave on the day with the calmest forecast, since entry depends on the sea and the tide, and swim the lagoon on whichever day is left; the lagoon runs morning and afternoon, so it fits around almost anything. The two are different enough that neither dulls the other. And if you are choosing exactly one and still cannot decide, our default advice is the lagoon for mixed groups and the cave for adults chasing a highlight.

Frequently asked questions

Which is better, the Blue Cave or the Blue Lagoon?
Neither is better; the cave suits sight-seekers with a full day, the lagoon suits swimmers, families and shorter budgets. The Blue Cave is a ten-hour €110 speedboat adventure, the Blue Lagoon a five-hour €60 swim in shallow, sheltered water.
How much more expensive is the Blue Cave than the Blue Lagoon?
The Blue Cave tour is €110 per person, while the Blue Lagoon half day is €60 per adult. The cave day also has extras paid locally, the entrance ticket bought on site and lunch in Hvar, while the lagoon has no entry fees.
Can children do the Blue Cave tour?
From age 8, yes; younger children cannot join, and under-5s are not allowed inside the cave at all. It is also not recommended for pregnant women or anyone with back problems, because of the fast boat on open water.
Is the Blue Lagoon tour rough like the Blue Cave?
No, the lagoon route stays in sheltered water and is the calmer of the two by a wide margin. The Blue Cave crossing is exposed and fast, which is why we point seasickness-prone guests at the lagoon.
Can you visit the Blue Cave and the Blue Lagoon in one day?
Not on a single tour; they are separate trips and each properly fills its own day. Do them on separate days, with the cave on the calmest forecast, since entry depends on sea conditions.

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