Altius recorded 307 priced readings of nonstop business-class round trips from Dallas (DFW) to London (LHR) booked 60 days out, across 137 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$4,692 to US$7,710. The lowest fare Altius scored on this window was US$4,692 for a 2026-11-21 departure, seen on 2026-09-22 — RARE at the time, 33.7% below the US$7,077 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.