The flight cost is almost negligible! British Airways, and possibly other airlines, offer packages where you do a short layover in Keflavik or Reykjavik, then

The flight cost is almost negligible! British Airways, and possibly other airlines, offer packages where you do a short layover in Keflavik or Reykjavik, then they provide you transportation to Blue Lagoon, then get you to your plane from Blue Lagoon. Hotel and Airbnb and hostel costs are very high compared to everywhere else in the world. Last time I went, I brought a small tent.