Inside Þríhnúkagígur volcano

Þríhnúkagígur is a dormant crater in the Bláfjöll hills south-east of Reykjavík, dormant for over 4,000 years by the operator's account, whose magma chamber has been opened to visitors by a cable lift from the rim. It is the most expensive half-day in this collection and only runs in summer: for those who want to stand inside a volcano and can pay for it, nothing else on the map does the same thing; for everyone else, the money buys several other days.

The figures, read today on insidethevolcano.com: 51,000 ISK for an adult and 25,000 ISK for ages 8 to 12. The season is 5 May to 30 October, so it is closed now, and the 2027 season opens for booking in mid-November 2026. Transfer from the BSÍ bus terminal in central Reykjavík is 4,500 ISK, plus 1,899 ISK for collection from hotels and bus stops. The operator, 3H-Travel, puts the tour at about four hours if you drive to the meeting point, a ski cabin in the hills, and up to six hours with the pick-up.

The day runs: briefing at the cabin, a guided walk of about 3 km each way across the lava field (45–50 minutes, rated 2 of 5), coffee and safety gear at base camp, a seven-minute descent of 120 m in an open lift, about half an hour on the chamber floor, soup back at base camp, and the walk out.

#The arithmetic

The ledger cost is the operator's own: 360 minutes door to door from a Reykjavík bed with the pick-up, 240 minutes on site if you drive to the cabin, plus your own drive. Booking is on fixed departures, so the pick-up time sets the day. The cost per minute on the chamber floor, from the operator's figures, is 51,000 ISK for 30 minutes, 1,700 ISK a minute; the lava tunnel at Raufarhólshellir is about 150 ISK a minute underground. On the five-day South Coast and Golden Circle journey, only the arrival day in Reykjavík has room for it, and only from May to October.

#What goes wrong

Weather on the walk: the operator's own advice is that however good it looks in Reykjavík, there is a good chance of rain and wind in the hills, so bring waterproofs. The trail gets wet and muddy. Tours run in small groups to fit the lift, so summer departures sell out. The cancellation terms are on the operator's terms page, which was not read today; check them before paying.

#Alternatives

For a summer-only volcano day at a fraction of the price, the lava tubes are the obvious substitute: Raufarhólshellir runs all year 40 minutes from town. Indoors, Volcano Express in Harpa, walk-in all year at 3,990 ISK with real footage of the 2021–2024 eruptions, and the Lava Show cover the eruptions and the rock without a hike.

#Sources

Inside the Volcano's tour page and booking page, both read 1 November 2026, for price, season, durations, itinerary and transfer costs.