Altius recorded 243 priced readings of nonstop business-class round trips from London (LHR) to San Diego (SAN) booked 90 days out, across 118 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$4,846 to US$12,748. The lowest fare Altius scored on this window was US$4,846 for a 2026-12-01 departure, seen on 2026-09-02 — RARE at the time, 35.8% below the US$7,548 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.