What day and time of the week tend to be the least crowded?
Blue Lagoon is one of the most popular tourist attractions in Iceland. There are limits on how many guests can visit at each time and, most often, the Blue Lagoon is fully booked until late afternoons 1-2 days in advance.
We highly recommend that you pre-book your ticket well in advance, to be sure that you can fit the Blue Lagoon in your Iceland travel schedule.
If you plan to visit without having pre-booked your entrance ticket, we can't guarantee an entrance ticket. In fact, it's very unlikely, especially if you are arriving before 18:00. Evenings are more suitable for walk-in guests as well as being less crowded.
The lagoon is big; you can always find a secluded spot by wandering further into the lagoon, away from the main building. What limits the number of guests are the lockers available in the changing rooms.