Altius recorded 310 priced readings of nonstop business-class round trips from Washington (IAD) to Paris (CDG) booked 30 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$3,717 to US$8,038. The lowest fare Altius scored on this window was US$4,438 for a 2026-08-23 departure, seen on 2026-07-24 — DECENT at the time, 14.5% below the US$5,191 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.