Altius recorded 90 priced readings of nonstop business-class round trips from Paris (CDG) to Detroit (DTW) booked 30 days out, across 45 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$5,619 to US$9,812. The lowest fare Altius scored on this window was US$5,630 for a 2026-10-05 departure, seen on 2026-09-05 — STRONG at the time, 19.4% below the US$6,985 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.