Secret Lagoon vs Blue Lagoon vs Sky Lagoon: Which Geothermal Spa is Right for You?
Steam rising over Iceland's Blue Lagoon geothermal spa on the Reykjanes Peninsula
Iceland's three most famous geothermal bathing destinations each offer a distinct experience—here's how to choose the right one for your Reykjavík trip.
Blue Lagoon: Iceland's Iconic Milky-Blue Experience Near Grindavík
The Blue Lagoon sits in a stark lava field on the Reykjanes Peninsula, roughly forty-five kilometres southwest of Reykjavík and a twenty-minute drive from Keflavík International Airport. This makes it the easiest geothermal spa to fold into an arrival or departure day: plenty of visitors soak on the way in from the airport or on the way out before an evening flight, storing luggage on site rather than doubling back to the capital. The water is the famous opaque, milky blue — silica-rich runoff from the neighbouring Svartsengi geothermal plant, held at a steady 37-39°C year-round. Entry is timed and sells out days or weeks ahead in July and August, so this is not a spa you can walk up to; book online before you leave home and take one of the calmer early-morning or late-evening slots if you can.
Two packages cover most visitors. Comfort, from roughly ISK 9,800 (about $72) per adult, includes admission, a silica mud mask, a towel and one drink at the swim-up bar; Premium adds a bathrobe, a second mask and a glass of sparkling wine with a meal at the Lava Restaurant. Plan on two to three hours inside. The one real complication is location: since 2021 the Reykjanes Peninsula has had recurring eruptions near Grindavík, and the Blue Lagoon — along with its own Silica and five-star Retreat hotels — has closed or evacuated intermittently since late 2023. Keflavík airport has stayed open throughout. Check the Icelandic Met Office at vedur.is on the day, and keep Sky Lagoon as a same-standard backup close to town. Choose the Blue Lagoon for the postcard setting and airport convenience, provided your dates are clear.
Sky Lagoon: The Oceanfront Ritual Closest to Reykjavík
Sky Lagoon opened in 2021 on the Kársnes headland in Kópavogur, about fifteen minutes by car from downtown Reykjavík and reachable on a city bus — by far the shortest hop of the three. Its signature is a long infinity edge where the geothermal water appears to spill straight into Faxaflói bay, with Bessastaðir and, on a clear day, the Snæfellsnes peninsula on the horizon. Unlike the Blue Lagoon the water here is clear rather than milky; you come for the ocean view and the ritual rather than the silica. Because it sits on the opposite side of the capital from Grindavík, it has stayed open right through the eruptions, which is exactly why it is the standard fallback when the Blue Lagoon closes.
The draw is the seven-step Skjól ritual: the warm lagoon, a cold plunge, a sauna with a picture window over the sea, a cold mist, a salt body scrub, a steam room and a final rinse. Admission runs about ISK 9,200 for the standard Pure Pass with a public changing room and around ISK 14,100 for the Sér Pass with private premium changing rooms; the ritual is included with both, putting Sky Lagoon in the same bracket as the Blue Lagoon. Allow about two hours for the full circuit. There is no mud mask and no on-site hotel, so most visitors come from a Reykjavík base and pair it with dinner in town. Choose Sky Lagoon if you are short on time, staying in the city without a car, or want the ocean-edge ritual over the lava-field setting.
Secret Lagoon: The Cheap, Low-Key Original at Flúðir
The Secret Lagoon — Gamla Laugin, 'the old pool' — sits in the village of Flúðir, about a hundred kilometres and ninety minutes east of Reykjavík on the Golden Circle. It is the oldest swimming pool in Iceland, built in 1891, and it feels it: a single natural, gravel-bottomed pool held at 38-40°C, ringed by low geothermal ground where a small geyser called Litli Geysir spouts every few minutes. There is no infinity edge, no seven-step ritual and no swim-up champagne — just steaming water, a boardwalk and a plain changing block. That plainness is the point, and it keeps both the crowds and the price down in a way neither of the designer spas can match.
Admission is roughly ISK 3,000-3,800 (about $22-28), a third of what the other two charge, and you rarely need to book far ahead. The location makes it a natural stop on a Golden Circle day rather than a destination in itself: Geysir and Gullfoss are twenty to thirty minutes north, Þingvellir an hour back toward town, so most people soak here to end a day of waterfalls and geysers. Facilities are basic — bring your own towel or rent one, and expect a simple café rather than a restaurant. Choose the Secret Lagoon if you are driving the Golden Circle, travelling on a budget, or want a low-key local pool instead of a polished spa experience.
Price, Location and Booking Compared
On price the three are not close. The Secret Lagoon at around ISK 3,000 is the clear budget option; the Blue Lagoon and Sky Lagoon both start near ISK 9,200-9,800 and climb into the ISK 14,000s with premium or private-changing tiers. On location, Sky Lagoon wins for anyone without a car — fifteen minutes from the centre of Reykjavík and on a bus route — while the Blue Lagoon's forty-five minutes only makes sense as an airport-day stop, and the Secret Lagoon's ninety minutes only as part of a Golden Circle loop. Factor transport into the real cost: a Blue Lagoon return coach transfer adds roughly ISK 8,000-10,000 per person, more than the Secret Lagoon's entire admission.
Booking discipline differs too. The Blue Lagoon runs strict timed entry and sells out weeks ahead in summer, so it needs the most forward planning; Sky Lagoon also uses timed slots but is easier to get into at short notice; the Secret Lagoon is the most walk-up-friendly of the three, though a summer evening can still fill. All three enforce the standard Icelandic rule of a thorough naked shower before you enter, and all provide lockers and rentable towels. If eruptions are active, confirm the Blue Lagoon is open on your dates before you commit — the other two sit well clear of the Grindavík zone and are unaffected.
Which Lagoon Is Right for Your Trip?
Match the spa to how you are travelling. If you are landing at or flying out of Keflavík and want the famous milky-blue soak, the Blue Lagoon is the obvious pick — just build in a backup in case Grindavík is erupting. If you are city-based without a car and want the single most convenient premium spa, choose Sky Lagoon: fifteen minutes out, ocean-edge, open year-round through the eruptions. If you are driving the Golden Circle or watching your budget, the Secret Lagoon delivers a genuine hot soak for a third of the price with the geysers and waterfalls on the same route.
You can also do more than one without repeating yourself, because they are genuinely different: the Blue Lagoon for the iconic setting and airport timing, Sky Lagoon for the ritual and the view, the Secret Lagoon for the cheap, old-fashioned dip. A common three-day pattern is Sky Lagoon on the evening you arrive in the city, the Secret Lagoon on your Golden Circle day, and the Blue Lagoon on the way to the airport. Wherever you soak, base yourself in Reykjavík — it has the widest choice of rooms at every price and puts all three lagoons within a day's reach.
Before you book
The questions people ask about Iceland, answered with this month’s numbers.
The Secret Lagoon at Flúðir is much the cheapest at around ISK 3,000-3,800 per adult. The Blue Lagoon and Sky Lagoon sit in a similar, higher bracket — roughly ISK 9,200-9,800 and up, climbing into the ISK 14,000s with premium or private-changing tiers. Add transport too: a Blue Lagoon return coach can cost more than the Secret Lagoon's whole admission.
Sky Lagoon, on the Kársnes headland in Kópavogur, is about fifteen minutes from downtown and reachable by city bus. The Blue Lagoon is 45-50 minutes southwest on the Reykjanes Peninsula, and the Secret Lagoon is about ninety minutes east at Flúðir on the Golden Circle.
It opens and closes intermittently. Since late 2023 the Blue Lagoon and its on-site hotels have evacuated several times because of eruptions near Grindavík, though Keflavík airport has stayed open throughout. Check vedur.is on the day and keep Sky Lagoon, which is unaffected, as a reliable backup.
The Blue Lagoon runs strict timed entry and sells out days or weeks ahead in summer, so book it first. Sky Lagoon also uses timed slots but is easier at short notice. The Secret Lagoon is the most walk-up-friendly, though busy summer evenings can still fill.
Yes, and they are different enough to be worth it. A common pattern from a Reykjavík base is Sky Lagoon on your arrival evening, the Secret Lagoon during a Golden Circle day, and the Blue Lagoon on your way to the airport before an evening flight.
