Secret Lagoon Iceland: What The 1891 Pool At Flúðir Is Actually Like

Steam sits over the water at Flúðir most of the year. That is the first thing that separates the Secret Lagoon from the engineered spas further along the route: this is a natural pool, cut into a geothermal area called Hverahólmi, with hot springs bubbling beside the water rather than hidden behind a plant room. The venue's own history says the pool was made in 1891, and that same page claims it is the oldest swimming pool in Iceland. That claim is the venue's, and it stays the venue's; no independent body confirms it. What is verifiable is simpler and, for many travellers, more interesting: this is a bathing site built around a natural hot spring, it holds 38-40°C all year, and its adult ticket is 4,500 ISK, the lowest base price of any ticketed lagoon on this site's roster.

This guide treats the Secret Lagoon on its own terms. It is not a Golden Circle stop-over write-up, and it is not a budget substitute for somewhere better. It is a specific kind of bathing experience, closer to how Icelanders have soaked for a century and a half than to the spa complexes that dominate the postcards, and the differences are worth understanding before you spend money on either.

What Is The Secret Lagoon At Flúðir?

The Secret Lagoon, known locally as Gamla Laugin, is a natural geothermal pool at Hverahólmi near the village of Flúðir in south Iceland. The venue says it was made in 1891 and calls it the oldest swimming pool in Iceland, a claim it makes about itself. The water flows continuously, fully replacing itself every 24 hours, and stays at 38-40°C year round.

The word "secret" has outlived any reality it once had. This is a ticketed commercial venue with a booking engine, a car park and a guesthouse, and framing it as hidden or undiscovered would be dishonest. What the name now marks is a difference in kind. The pool is a basin of continuously flowing geothermal water sitting inside an active geothermal field, and the field is part of the visit: small springs erupt beside the pool, steam columns drift across the grounds, and the whole site smells faintly of sulphur because the water is genuinely rich in it.

The venue's published history adds texture that most lagoon pages lack. Bathing at Hverahólmi is described as an old tradition, the site housed the legislative body of the Flúðir community until 1894, and the first swimming lessons in Iceland were held here in 1909, repeating every year until 1947. After that, the venue says, Gamla Laugin "fell into many years of oblivion" before its revival. Whether or not every detail survives an archivist's scrutiny, the physical site plainly carries more history than a lagoon poured in the last decade.

For orientation, the venue publishes GPS coordinates of 64° 8,238'N, 20° 18,557'W, which places it just outside Flúðir village in the Golden Circle lowlands. The practical consequence of the geography is that this is a flat, walkable site: you move between changing rooms, pool and the surrounding springs on gravel paths, not through corridors. If you want a deeper comparison of how the region's bathing options stack up by price, our Iceland lagoon ticket prices compared guide carries the full roster.

What Does The Secret Lagoon Ticket Include?

The base ticket includes entry to the pool and the surrounding geothermal area, nothing more. Towels and swimsuits are rentals at 1,200 ISK each, there is no in-water bar, no ritual circuit and no restaurant on the standard admission. That spareness is why the adult price is 4,500 ISK while the big spas run several times higher.

This is where expectations get managed, or should be. The ticket is thin by design, and the venue's own price page makes no pretence otherwise. What you are buying is the water, the setting and the springs around it. What you are not buying is the infrastructure that makes a modern spa feel like a spa.

The shower rule applies here exactly as it does everywhere else in the country. Icelandic regulation 814/2010 requires guests to wash without swimwear before entering pools, and the venue's own pages follow the national norm. If the naked-shower custom is new to you, our piece on rules and etiquette for Icelandic hot springs covers what to expect in the changing rooms.

One point on booking: the venue states that pre-booking is highly appreciated and that, due to demand, it cannot guarantee a spot to unbooked visitors. That is softer language than Blue Lagoon's flat "pre-booking is essential", but in practice, in summer, treat a reservation as required. Walk-ins do happen, and they do sometimes wait.

How Much Does The Secret Lagoon Cost Compared With Other Lagoons?

Adults 15 and over pay 4,500 ISK at the gate, seniors 67+ and visitors with disabilities pay 3,300 ISK with ID, and the live listing shows from $35. That makes it the cheapest ticket on this site's fourteen-venue roster, roughly a quarter of the Blue Lagoon's from-price and under half of Sky Lagoon's.

The venue publishes no child price that can be trusted. The figure displayed on its own page is inconsistent with every other number there and appears to be a typo, so it does not appear here; children 14 and under are admitted, capped at three per accompanying parent, but confirm the current child rate directly before you travel. What is solid is the adult tier and the concession tier, both published plainly on the venue's homepage.

Set against the rest of the country's ticketed lagoons, the price gap is stark. The table below uses each listing's adult from-price as shown on the live listing, in the currency the listing displays.

The honest reading of that table is not "cheapest wins". The Blue Lagoon ticket includes a towel, a drink and a mud mask; the Secret Lagoon ticket includes water. Once you add towel and swimsuit rentals at 1,200 ISK each, the real gap narrows, though it remains wide. What the price actually buys is a different experience, which is the subject of the next section.

How Does A Natural Pool Feel Different From An Engineered Lagoon?

A natural pool like Gamla Laugin is a basin of continuously flowing spring water in an open geothermal field, with eruptions and steam beside the bathing area. Engineered lagoons are built environments: poured basins, controlled temperatures, saunas, bars and ritual circuits. The Secret Lagoon offers the first experience and almost none of the second.

The distinction matters more than any price comparison. At the Secret Lagoon, the geology is visible and audible. Small springs erupt on the grounds, steam moves with the wind, and the water renews itself completely every 24 hours through continuous flow, which is the venue's substitute for the chlorine and treatment systems of a conventional pool. The water is warm rather than hot, 38-40°C, and the pool is a single basin, not a circuit of pools, plunges and saunas at graduated temperatures. The full index of guides sits on Lagoons in Iceland.

Across four venues, the contrast looks like this:

Venue	Water source	Setting	Extras beyond the water
Secret Lagoon	Natural spring, continuous flow, 24-hour renewal	Open geothermal field at Hverahólmi	Hot springs and paths on site; no spa circuit
Krauma	Water from Deildartunguhver, cooled with glacier-fed cold water	Purpose-built spa beside the spring	Five hot baths, cold plunge, sauna, restaurant
Hvammsvík	Geothermal springs meeting the ocean at Hvalfjörður	Eight natural pools on a shoreline	Sauna, steam room, cold plunge, swim-up bar, bistro
Sky Lagoon	Geothermal lagoon, 38-40°C	Engineered clifftop complex in Kópavogur	Seven-step Skjól ritual, saunas, cold plunge, café and bar

Neither column is better. Travellers who want a ritual, a towel waiting and a drink at the bar should book the engineered venues and pay for them. Travellers who want to soak in something the landscape produced, with the springs still working around them, will find that here at a price that leaves room in the day's budget for dinner. Our wider comparison of glacier lagoons and geothermal lagoons unpacks the other axis of that choice.

How Long Should You Stay, And When Is It Open?

The venue publishes no recommended visit length, so there is no verified figure to quote. Opening hours are seasonal: daily 10:00-20:00 from 1 June to 30 September, and daily 10:00-19:00 from 1 October to 31 May, with 10:00-18:00 on 24 and 31 December. Most visits naturally run one to two hours.

That last sentence is a planning observation, not a venue claim, and it is worth being clear about the difference. Some lagoons publish a recommended duration, Forest Lagoon for instance asks guests not to stay longer than two hours, and Blue Lagoon lets you stay as long as you like within opening hours. The Secret Lagoon publishes nothing on the question. In practice, a single warm pool with no circuit to work through tends to produce shorter visits than a multi-pool spa, and many visitors pair it with the surrounding springs and leave within two hours.

Timing within the day is a matter of daylight and tour traffic rather than any published quiet period, and this site will not invent a "quietest time" claim no source supports. What can be said is structural: the pool is outdoors and unlit beyond basic safety lighting, the water is the same temperature in January and July, and the winter half of the year brings both darkness and smaller crowds to the Golden Circle generally. For the darker months, our guide to Iceland lagoons with dark skies covers what that means for evening soaks, within the official position that aurora sightings carry no guarantees.

What Other South Iceland Soaks Are Nearby?

Within the Golden Circle lowlands, Laugarvatn Fontana is the closest comparable ticketed venue, from $47 with steam baths on a lake shore, and the new Reykjaböð at Hveragerði opened 5 September 2026 from $64. Laugarás Lagoon, opened in 2025, runs from $73. All four sit within a short drive of Flúðir.

Fontana deserves the closest look, because it is the venue the Secret Lagoon is most often compared against. It sits on the shore of Laugarvatn lake, its steam baths are fed by a geyser beneath the floor, and you can step from hot steam straight into the cold lake. Its listing rating, 4.2 from 167 reviews, is the lowest on the roster and worth stating plainly: guests consistently like the experience, but the review record is both smaller and cooler than the Secret Lagoon's 4.7 across 2,124. Our full Fontana baths guide has the detail.

For drive-time planning, only venue-published figures belong in a table, and the Secret Lagoon itself publishes no distance from Reykjavík. The nearest verifiable anchor is Fontana's own page, which gives 77 km from Reykjavík and 35 km from Flúðir, placing the Secret Lagon a similar day-trip radius from the capital.

Venue	Published distance or time from Reykjavík	Source of the figure
Sky Lagoon	13 minutes from the city centre	Venue's getting-here page
Blue Lagoon	45-50 minutes	Venue's plan-your-visit page
Hvammsvík	52 km, about 45 minutes	Venue's how-to-find-us page
Laugarvatn Fontana	77 km, about 50 minutes' drive	Venue's how-to-get-there page
Krauma	97 km	Venue's opening-hours page
Earth Lagoon Mývatn	473 km	Venue's own distances page
Secret Lagoon	No venue-published figure	Nearest anchor: Fontana, 35 km from Flúðir

The Fontana directions page is also the best published source for road numbers in the area: Laugarvatn sits on road 37 toward Geysir and Gullfoss, with road 354 connecting to Þingvellir. Flúðir is a short continuation east. A rental car is the normal way to reach the Secret Lagoon; no venue-run shuttle exists, unlike Forest Lagoon in the north, which operates a free published timetable from Akureyri.

Is The Secret Lagoon Worth It?

For most travellers, yes, provided the visit is chosen for what it is. At $35 from-price and 4.7 across 2,124 reviews, it is the strongest value-to-satisfaction ratio on the roster. It is worth it for natural-setting bathing and low cost, and not worth it for anyone expecting a spa circuit, private changing or in-water service.

The review record is the strongest evidence available, and it is unusually strong: 4.7 from more than two thousand reviews on the live listing puts it above the Blue Lagoon's 4.6 from 6,220 and within a whisker of Sky Lagoon's 4.8. Guests are not being charitable to a cheap ticket; they are describing an experience that delivers what it promises. The venue also operates a guesthouse at Garður with four double bedrooms and pool access during opening hours, which suits anyone wanting to soak late and sleep close.

The case against is equally clear. If your mental image of an Icelandic lagoon involves a swim-up bar, a seven-step ritual or a towel folded on a heated bench, this is not that place, and the savings will not compensate. The pool is one basin, the changing facilities are simple, and the sulphur smell that some visitors find charming, others find intrusive. Our budget lagoons guide places the Secret Lagoon in its wider context for travellers optimising cost across a whole trip.

One last practical note that belongs to this venue alone among the roster: the Secret Lagoon's own pages accept ISK, USD and EUR cash as well as most cards, which is unusual, and worth knowing in a country where you should not assume any single payment norm. Reserve ahead in summer, bring or rent a towel, leave the silver jewellery somewhere dry, and treat the surrounding springs with the respect the national safety guidance asks of every geothermal site: stay on paths, behind fences and rails, because unstable ground at hot springs can be genuinely dangerous.

Common Questions About The Secret Lagoon

How much does the Secret Lagoon cost?

Adults 15 and over pay 4,500 ISK, seniors 67+ and visitors with disabilities pay 3,300 ISK with valid ID, and the live listing shows from $35. Swimsuit and towel rental are 1,200 ISK each. The venue's displayed child price appears to be a typo and should be confirmed directly before booking.

Is the Secret Lagoon actually secret?

No. It is a fully ticketed commercial venue with online booking, and the venue itself says demand is high enough that it cannot guarantee entry without a reservation. The name refers to its history and low profile, not to any current obscurity.

Is the Secret Lagoon the oldest pool in Iceland?

That is the venue's own claim: it says the pool was made in 1891 and calls it the oldest swimming pool in Iceland. No independent source in this site's research confirms the superlative, so treat it as the venue's description rather than established fact.

How hot is the Secret Lagoon?

The venue publishes a water temperature of 38-40°C, held all year round. The pool water flows continuously and fully replaces itself every 24 hours, which is why the venue uses no chlorine.

How long should you spend at the Secret Lagoon?

The venue publishes no recommended duration. Most visits run one to two hours, since the site is a single pool with no sauna circuit or ritual to work through, but that is a planning observation rather than a venue instruction.

Do you need to book the Secret Lagoon in advance?

The venue says pre-booking is highly appreciated and that it cannot guarantee a spot without one, especially in the summer season of 1 June to 30 September. Booking through the live listing also carries free cancellation if plans change.