Altius recorded 308 priced readings of nonstop business-class round trips from Chicago (ORD) to London (LHR) booked 30 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$4,087 to US$7,811. The lowest fare Altius scored on this window was US$4,087 for a 2026-07-28 departure, seen on 2026-06-28 — DECENT at the time, 12.9% below the US$4,692 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.