Altius recorded 251 priced readings of nonstop business-class round trips from London (LHR) to ReykjavÃk (KEF) booked 90 days out, across 121 departure dates between 2026-06-06 and 2026-10-05. Observed fares ran from US$446 to US$1,191. The lowest fare Altius scored on this window was US$446 for a 2026-12-03 departure, seen on 2026-09-04 — STRONG at the time, 16.5% below the US$534 this route was typically running that day.
A fare can move between our two readings of the same day, most often on the days furthest below typical. Where a day's two readings differ enough to matter, the chart marks that day and both readings can be read separately.