Altius recorded 305 priced readings of nonstop business-class round trips from San Francisco (SFO) to London (LHR) booked 60 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$3,919 to US$10,149. The lowest fare Altius scored on this window was US$3,919 for a 2026-11-17 departure, seen on 2026-09-18 — IMPRESSIVE at the time, 27.5% below the US$5,406 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.