Blue Lagoon

About Blue Lagoon

The Blue Lagoon is a man-made geothermal spa in a black lava field on the Reykjanes Peninsula in southwest Iceland, filled with milky-blue seawater from the neighboring Svartsengi Resource Park. Since it sits about 20 minutes from Keflavík International Airport and about 45 minutes from Reykjavík, many travelers time a Blue Lagoon Iceland visit for the day they land or the day they fly home.

The water comes from deep wells at Svartsengi, roughly 70% seawater and 30% fresh water, and it stays at 37–39°C all year. Silica gives it the pale blue color, and the same silica becomes the white mud you smear on your face at the in-water mask bar. Expect a slow, social soak rather than a swim, with a swim-up bar, a sauna and a steam bath around the edges.

Entry is by timed ticket, and Blue Lagoon Iceland tickets for popular slots sell out days or even weeks ahead, so book through the official website as soon as your dates are fixed. Comfort, the cheapest package, covers entry, a silica mud mask, a towel and a first drink, while the higher tiers add extras such as a bathrobe and slippers. Prices change with the season, the day and your arrival time, and early-morning or late-evening slots are usually the calmest.

Plan on two to three hours in the water, plus time to shower and change. Children aged 2 and over are allowed, kids 13 and under get in free with a paying adult, and those 8 and under wear free armbands. For a quieter and pricier spa day, the Retreat at Blue Lagoon on the same site has its own private lagoon and changing suites.

In winter, the Blue Lagoon at night has real appeal, with steam rising under a dark sky and, on a clear night with a good forecast, a chance of northern lights overhead. Drivers follow Route 41 toward the airport and turn south on Route 43. A day trip to the Blue Lagoon from Reykjavík with hotel pickup takes the planning off your hands.

The lagoon lies beside the Sundhnúkur crater row, which erupted repeatedly between December 2023 and August 2025, most recently from July 16 to August 5, 2025. Magma was still accumulating beneath Svartsengi in 2026, so another eruption could start with little warning. The Blue Lagoon usually closes when one begins and reopens once the authorities judge it safe, so check its official updates the day before you go.