Altius recorded 249 priced readings of nonstop business-class round trips from London (LHR) to Washington (IAD) booked 60 days out, across 121 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$3,336 to US$5,456. The lowest fare Altius scored on this window was US$3,361 for a 2026-11-16 departure, seen on 2026-09-17 — DECENT at the time, 13.8% below the US$3,899 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.