Blue Lagoon vs. Sky Lagoon : quel spa thermal choisir en Islande ?

Iceland, the land of fire and ice, is renowned for its extraordinary geothermal activity that has given rise to some of the world’s most spectacular natural hot springs and thermal spas. Among these, two have emerged as must-visit destinations for travelers: the iconic Blue Lagoon and the newer, increasingly popular Sky Lagoon. Both offer unforgettable bathing experiences in mineral-rich waters, but they differ significantly in atmosphere, location, facilities, and overall experience. This comprehensive guide will help you decide which thermal spa best suits your Icelandic adventure.

The Legendary Blue Lagoon: Iceland’s Most Famous Thermal Spa

Origins and Setting

The Blue Lagoon isn’t actually a natural formation, but rather a happy accident of human industry. In 1976, the runoff from the nearby Svartsengi geothermal power plant formed a pool that locals soon discovered had remarkable healing properties for skin conditions. The milky blue water, colored by silica, algae, and minerals, sits dramatically against black lava fields, creating one of Iceland’s most photographed landscapes.

Located in Grindavík on the Reykjanes Peninsula, about 45 minutes from downtown Reykjavík and 20 minutes from Keflavík International Airport, the Blue Lagoon has evolved from a local secret to a world-famous wellness destination attracting over one million visitors annually.

The Experience

Stepping into the Blue Lagoon is an otherworldly experience. The opaque, milky-blue water maintains a constant temperature between 98-104°F (37-40°C), creating a stark contrast with Iceland’s often chilly air. Steam rises continuously from the surface, adding to the mystical atmosphere. The lagoon itself is expansive, covering over 8,700 square meters with water that completely renews itself every 48 hours.

The bottom of the lagoon is natural lava rock, though parts have been smoothed for comfort. Scattered throughout are wooden boxes containing the famous white silica mud, which visitors apply as natural face masks. The water itself is rich in silica, algae, and minerals like sulfur, which give it therapeutic properties particularly beneficial for skin conditions like psoriasis.

Facilities and Amenities

Over decades, the Blue Lagoon has developed into a comprehensive wellness complex:

• Multiple pool areas with varying depths and temperatures
• In-water bar serving drinks you can enjoy while bathing
• Sauna and steam rooms overlooking the lagoon
• Man-made waterfall providing natural shoulder massages
• Silica mud mask bar and additional algae masks depending on your package
• In-water massage treatments on floating mattresses (for an additional fee)
• Private luxury changing rooms (with premium packages)
• Lava Restaurant offering fine dining with lagoon views
• Restaurant Moss (Michelin-recommended) for a gourmet experience
• Blue Café for casual dining
• Luxury hotel accommodations at the Silica Hotel and The Retreat

The Blue Lagoon completed a significant expansion in 2018 with the opening of The Retreat, an exclusive section with a private lagoon, luxury hotel, and underground spa carved into the volcanic earth.

Packages and Cost

The Blue Lagoon operates on a tiered pricing system with three main entry packages:

1. Comfort Package (starting around 8,990 ISK/$65 USD): Includes entrance, silica mud mask, use of towel, and one drink.
2. Premium Package (starting around 11,990 ISK/$85 USD): Includes all Comfort benefits plus second mask of choice, use of bathrobe, slippers, and dining reservation if desired.
3. Retreat Spa (starting around 59,000 ISK/$430 USD): The luxury option including private changing rooms, exclusive access to the Retreat Lagoon, the full Blue Lagoon Ritual treatment, and access to the Retreat Spa.

Prices vary significantly by season, time of day, and how far in advance you book. Early morning and evening slots tend to be less expensive, while midday times command premium prices, especially during high season (June-August).

Atmosphere and Crowds

The Blue Lagoon’s international fame means it’s rarely empty. During peak hours and high season, expect to share the waters with hundreds of other visitors. The lagoon’s size helps disperse crowds, but the most popular areas—like the mud mask stations and in-water bar—can become congested.

For a more peaceful experience, book the first slot of the day (typically 8:00 AM) or an evening slot after 6:00 PM when many tour groups have departed. Winter visitors often enjoy the magical experience of soaking in warm waters while snow falls or the northern lights dance overhead.

The overall vibe tends toward “tourist attraction” rather than “local hangout,” with many visitors clearly there to capture Instagram-worthy photos among the steam and blue waters.

The Newcomer: Sky Lagoon’s Ocean-Side Luxury

Origins and Setting

Opened in 2021, Sky Lagoon represents the next evolution in Iceland’s thermal spa offerings. Unlike the Blue Lagoon’s industrial origins, Sky Lagoon was designed from the ground up as a premium bathing experience that blends traditional Icelandic bathing culture with modern luxury.

Located in Kársnes, just 15 minutes from downtown Reykjavík, Sky Lagoon is built on the oceanfront, offering breathtaking views across the North Atlantic. The 70-meter infinity edge creates the illusion that the warm geothermal waters merge directly into the sea, especially dramatic during sunset or when waves crash against the nearby shore.

The Experience

Sky Lagoon masterfully blends natural and built environments. The main lagoon is constructed from dark concrete and natural stones arranged to mimic Iceland’s rugged coastline. The water appears darker than the Blue Lagoon’s milky blue—more of a steely gray-blue that reflects the Icelandic sky. While smaller than the Blue Lagoon at approximately 4,000 square meters, it’s designed to create more intimate, discovery-based experiences with coves, corners, and viewpoints to explore.

The crown jewel of the experience is the 75-foot infinity edge that creates a borderless vista of the ocean horizon. A partially submerged observation shelf allows bathers to sit and contemplate the North Atlantic, potentially spotting whales or fishing boats. A swim-up waterfall grotto provides shelter during rain or snow, enhancing the feeling of being immersed in Iceland’s elemental nature.

The Seven-Step Ritual

What truly distinguishes Sky Lagoon is its codification of traditional Icelandic bathing practices into “The Ritual,” a seven-step process included with Pure Pass and Sky Pass tickets:

1. Slow immersion in the warm lagoon to relax and open pores
2. Cold plunge in a 50°F (10°C) pool to stimulate circulation
3. Sauna session in the stunning oceanfront sauna with what might be Iceland’s largest window, offering panoramic sea views (10-15 minutes recommended)
4. Cold fog-mist space for refreshing skin after the sauna heat
5. Body scrub using Sky Lagoon’s signature exfoliating scrub
6. Steam room immersion to allow the scrub to work deeply
7. Final warm lagoon relaxation to complete the ritual

This carefully designed sequence represents centuries of Icelandic wellness tradition reimagined for the modern visitor. Even if you opt not to complete all steps, the oceanfront sauna alone is worth experiencing, as steam occasionally clears from the massive window to reveal spectacular ocean panoramas.

Facilities and Amenities

Sky Lagoon facilities emphasize quality over quantity:

• Main infinity-edge thermal lagoon with consistent 100-104°F (38-40°C) temperature
• Cold plunge pool for contrast therapy
• Oceanfront sauna with panoramic window
• Steam room with eucalyptus infusion
• Fog-mist space for cooling between heat experiences
• Turf house relaxation space built in traditional Icelandic style
• Lagoon Bar serving drinks without needing to leave the water
• Smakk Bar restaurant offering small plates and Icelandic specialties
• Well-appointed shower facilities with Sky Lagoon’s signature products

The changing areas deserve special mention—the communal changing areas are designed like upscale spa facilities, while those opting for the Sky Pass get access to private changing facilities similar to luxury health clubs.

Packages and Cost

Sky Lagoon offers a simpler tiered system than Blue Lagoon:

1. Pure Lite Pass (starting around 7,990 ISK/$58 USD): Includes admission and public changing facilities.
2. Pure Pass (starting around 9,990 ISK/$73 USD): Includes admission, public changing facilities, and The Ritual.
3. Sky Pass (starting around 12,990 ISK/$95 USD): The premium option including admission, private changing facilities, The Ritual, and Sky Lagoon amenities.

Like Blue Lagoon, prices fluctuate based on date, time, and booking window, though generally with less extreme variation.

Atmosphere and Crowds

Being newer and slightly smaller, Sky Lagoon can still get crowded but typically handles the flow better than Blue Lagoon. The design intentionally creates multiple smaller spaces rather than one large bathing area, giving the impression of more personal space even when at capacity.

The clientele tends to skew slightly older and more sophisticated than Blue Lagoon, with fewer families and more couples or adult friends. The atmosphere is deliberately tranquil, with subtle lighting and an emphasis on contemplative relaxation rather than social activity.

Evening visits are particularly magical as the sun sets over the Atlantic horizon, casting golden light across the water. Winter visitors might be treated to northern lights viewing directly from the warm lagoon—a truly spectacular experience.

Head-to-Head Comparison: Making Your Choice

Location and Accessibility

Blue Lagoon: Situated between Reykjavík and Keflavík International Airport, the Blue Lagoon is ideally positioned for visitors either just arriving in Iceland or preparing to depart. Many travelers build it into their itinerary as either their first or last activity in Iceland, sometimes visiting directly from/to the airport with luggage storage available.

Sky Lagoon: Located in Kársnes harbor, just a 15-minute drive from downtown Reykjavík, Sky Lagoon is more convenient for those staying in the capital without a rental car. It’s easily reached by taxi or through hotel shuttle services, making it perfect for a half-day excursion during your Reykjavík stay.

Winner for convenience: Blue Lagoon for airport connectivity, Sky Lagoon for easy access from Reykjavík.

Natural Setting and Views

Blue Lagoon: Set among black lava fields with distant views of the Svartsengi geothermal plant’s steam plumes, the Blue Lagoon offers a distinctly otherworldly landscape that feels uniquely Icelandic. The contrast of milky blue water against black rock creates dramatic visuals in any weather.

Sky Lagoon: The oceanfront setting with infinity-edge views across the North Atlantic offers a different but equally spectacular Icelandic landscape. The connection to the ocean, potential wildlife sightings, and sunset views create a more dynamic visual experience that changes throughout the day and seasons.

Winner for views: Sky Lagoon for most visitors, though Blue Lagoon offers a more uniquely Icelandic aesthetic that can’t be experienced elsewhere.

Water Properties and Health Benefits

Blue Lagoon: The milky blue water contains silica, algae, and minerals that have documented benefits for skin conditions. The silica mud masks are particularly beneficial for exfoliation and deep cleaning. The water completely renews every 48 hours, ensuring cleanliness.

Sky Lagoon: The water comes from Iceland’s geothermal systems but contains a different mineral profile than Blue Lagoon. While still beneficial for relaxation and skin, it lacks the distinctive silica content. Sky Lagoon compensates with their seven-step ritual that enhances the therapeutic benefits beyond just soaking.

Winner for therapeutic properties: Blue Lagoon for its unique silica-rich waters with proven skin benefits.

Value for Money

Blue Lagoon: Generally more expensive, especially for premium experiences. The base package provides a similar experience to Sky Lagoon’s entry-level offering but typically at a higher price point. The Retreat experience, while exceptional, represents one of Iceland’s most premium spa experiences.

Sky Lagoon: Usually offers better value, with its mid-tier Pure Pass (including The Ritual) comparable in price to Blue Lagoon’s basic package. The premium Sky Pass remains more affordable than Blue Lagoon’s Premium option while offering a more comprehensive experience.

Winner for value: Sky Lagoon typically offers more inclusions at lower price points.

Crowds and Ambiance

Blue Lagoon: Generally busier with a more diverse crowd including families, tour groups, and travelers of all ages. The atmosphere can sometimes feel more like a tourist attraction than a spa, especially during peak hours.

Sky Lagoon: Tends to maintain a calmer, more adult-oriented atmosphere focused on relaxation and wellness. The design disperses visitors more effectively, creating a sense of discovery and privacy even when relatively full.

Winner for tranquility: Sky Lagoon, especially during weekday evenings.

Food and Beverage

Blue Lagoon: Offers more dining options across different price points, from casual café fare to the Michelin-recommended Moss Restaurant. The in-water bar serves a variety of alcoholic and non-alcoholic options.

Sky Lagoon: Limited to the Smakk Bar restaurant serving Icelandic-inspired small plates and the Lagoon Bar for in-water refreshments. The quality is excellent, but options are fewer.

Winner for dining: Blue Lagoon for variety, especially for those planning to make a full day of their visit.

Additional Wellness Offerings

Blue Lagoon: Provides numerous add-on treatments including in-water massages, private massage rooms, and specialized skin treatments using proprietary Blue Lagoon products. The Retreat Spa offers additional exclusive treatments.

Sky Lagoon: Currently offers fewer add-on treatments, focusing instead on The Ritual as the core wellness experience included with most packages. While effective, options for customization are more limited.

Winner for treatments: Blue Lagoon offers more variety and specialization in additional wellness services.

Instagram Appeal

Blue Lagoon: The iconic milky blue water against black lava creates instantly recognizable photos that have become synonymous with Iceland on social media. The larger space offers more photo opportunities and angles.

Sky Lagoon: The infinity edge with ocean views provides spectacular photo opportunities, especially at sunset. The turf houses and design elements offer unique architectural details not found at Blue Lagoon.

Winner for photography: Tie – both offer distinct and compelling visuals that capture different aspects of Iceland’s appeal.

Who Should Choose Blue Lagoon?

The Blue Lagoon remains the better choice for:

• First-time visitors to Iceland seeking the iconic experience
• Travelers with airport connections looking to maximize their itinerary
• Families with children (children 2-13 are permitted with adults; Sky Lagoon only allows ages 12+)
• Visitors interested in specific skin treatments or therapeutic benefits of silica
• Travelers seeking full-day experiences with multiple dining options
• Luxury travelers interested in The Retreat experience or overnight accommodations
• Those fascinated by the unique milky-blue water that defines Blue Lagoon

Who Should Choose Sky Lagoon?

Sky Lagoon is ideal for:

• Repeat visitors to Iceland looking for a new experience
• Travelers based in Reykjavík without airport transfers
• Adults seeking a more tranquil, sophisticated atmosphere
• Photography enthusiasts interested in ocean and sunset views
• Those interested in traditional Icelandic bathing culture through The Ritual
• Visitors seeking better value in their thermal spa experience
• People who prefer a less crowded, more intimate setting

Can You Visit Both? Is It Worth It?

Many travelers wonder if visiting both thermal spas is redundant or worthwhile. Having experienced both, I can confidently say they offer distinctly different experiences that complement rather than duplicate each other.

If your itinerary and budget allow, experiencing both provides a fuller understanding of Iceland’s geothermal bathing culture—Blue Lagoon representing the iconic, internationally famous side, and Sky Lagoon offering a more authentic connection to traditional Icelandic wellness practices.

A practical approach for a 4+ day Iceland trip might be:

1. Visit Blue Lagoon upon arrival or before departure, coordinating with your flight schedule
2. Visit Sky Lagoon during your time in Reykjavík, perhaps scheduling an evening visit to catch the sunset

Combination Strategies

For a more budget-conscious approach, consider:

• Choosing the basic package at Blue Lagoon but the full Sky Pass at Sky Lagoon
• Spending less time at Blue Lagoon (2 hours is sufficient for the basic experience) but allowing 3-4 hours to fully enjoy Sky Lagoon’s Ritual
• Bringing your own towel to Blue Lagoon to save on rentals (not possible with Sky Lagoon as their packages include necessary amenities)

Practical Tips for Visiting Either Spa

Regardless of which lagoon you choose, these tips will enhance your experience:

Booking Advice

• Book well in advance: Both spas frequently sell out, especially during high season (June-August).
• Consider off-peak times: Early morning (first slot) or evening (last 2-3 hours before closing) typically offer the best experience with fewer crowds.
• Check for packages: Some tour companies and hotels offer transportation packages that can save money compared to booking separately.
• Be strategic with timing: Blue Lagoon works well as an arrival or departure day activity due to its proximity to the airport, while Sky Lagoon is better experienced during your Reykjavík stay.

Pre-Visit Preparation

• Bring your swimsuit: While both locations offer swimsuit rental, bringing your own is more comfortable and hygienic.
• Remove jewelry: The minerals in the water can affect certain metals; silica at Blue Lagoon can be particularly hard on silver jewelry.
• Skip the hair products: If you plan to wet your hair, apply conditioner before entering and leave it in. The minerals, especially at Blue Lagoon, can make hair stiff and difficult to manage for days.
• Stay hydrated: Bring a reusable water bottle or plan to purchase water, as the hot water and steam can be dehydrating.
• Shower protocol: Both spas require thorough showering without swimwear before entering the water—this is strictly enforced and an important part of Icelandic bathing culture.

During Your Visit

• Protect your phone: Waterproof phone cases are worth the investment if you plan to take photos. The steam and minerals can damage electronics.
• Plan for relaxation: Allow enough time to fully enjoy the experience without rushing—minimum 2 hours for Blue Lagoon and 3 hours for Sky Lagoon if doing The Ritual.
• Respect the quiet: Icelandic bathing culture emphasizes tranquility; keep conversations at a moderate volume, especially at Sky Lagoon.
• Move around: Both lagoons have varying temperatures in different areas; explore to find your perfect spot.
• Stay within your limits: The heat and minerals combined with cold plunges (at Sky Lagoon) can be physically taxing. Listen to your body and exit the water if feeling lightheaded.

Post-Visit Considerations

• Skin sensitivity: The minerals might leave your skin feeling different for 1-2 days after visiting; some people experience temporary redness that quickly subsides.
• Hair care: Use extra conditioner after your visit, especially after Blue Lagoon, to counteract any dryness from the silica.
• Rest time: Consider planning a relaxing evening after your visit rather than strenuous activities, as the thermal waters can have a powerfully relaxing (even sleep-inducing) effect.

Considérations saisonnières

The experience at both lagoons varies dramatically with Iceland’s seasons:

Summer (June-August)

• Longer opening hours with midnight sun providing unique late-evening bathing opportunities
• Busiest season with advance booking absolutely essential
• Warmer ambient temperatures making transitions between indoors and outdoors more comfortable
• Sky Lagoon’s sunset views shift to very late evening (near midnight in June)

Shoulder Seasons (April-May, September-October)

• Ideal balance of decent weather, reasonable daylight hours, and fewer crowds
• Greater availability of preferred time slots and packages
• Beautiful autumn or spring light enhancing photography opportunities
• More moderate prices than peak summer season

Winter (November-March)

• Magical snow-covered experiences with steam rising dramatically against dark skies
• Northern lights potential from both locations (slightly better at Sky Lagoon due to less light pollution)
• Challenging transitions between changing areas and water in very cold or windy conditions
• Des heures de clarté plus courtes affecting timing of visits (midday offers best natural light for photos)

The Verdict: Which Should You Choose?

The “better” thermal spa depends entirely on your priorities, budget, and what type of experience you’re seeking in Iceland.

Choose Lagon bleu if you want the quintessential Iceland experience that has become world-famous, don’t mind potentially larger crowds, and value the unique therapeutic properties of its silica-rich waters.

Choose Sky Lagoon if you prefer a more authentic connection to Icelandic bathing traditions, value tranquility and ocean views, and appreciate thoughtful design that creates a more intimate wellness journey.

Or better yet, choose both to experience the full spectrum of what Iceland’s geothermal wonders have to offer—from the otherworldly blue oasis in the lava fields to the sophisticated ocean-edge thermal experience that connects you to both Iceland’s traditions and its stunning natural beauty.

Whichever you choose, these thermal waters offer more than just relaxation; they provide a window into Iceland’s unique relationship with its geothermal resources and a chance to participate in the bathing culture that has sustained Icelanders through centuries of dark winters and brief, brilliant summers. There’s something profoundly connecting about floating in these warm waters while surrounded by Iceland’s dramatic landscapes—a memory that will likely become a highlight of your journey to this extraordinary island.