Altius recorded 247 priced readings of nonstop business-class round trips from London (LHR) to San Francisco (SFO) booked 30 days out, across 120 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$3,900 to US$18,806. The lowest fare Altius scored on this window was US$4,372 for a 2026-08-17 departure, seen on 2026-07-18 — DECENT at the time, 10.7% below the US$4,896 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.