Altius recorded 94 priced readings of nonstop business-class round trips from Paris (CDG) to Boston (BOS) booked 30 days out, across 47 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$3,638 to US$10,635. The lowest fare Altius scored on this window was US$3,638 for a 2026-10-19 departure, seen on 2026-09-19 — STRONG at the time, 21.5% below the US$4,634 this route was typically running that day.
Altius recorded 94 priced readings of nonstop business-class round trips from Paris (CDG) to Boston (BOS) booked 60 days out, across 47 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$2,867 to US$8,803. The lowest fare Altius scored on this window was US$2,867 for a 2026-11-23 departure, seen on 2026-09-24 — IMPRESSIVE at the time, 24.6% below the US$3,802 this route was typically running that day.
Altius recorded 94 priced readings of nonstop business-class round trips from Paris (CDG) to Boston (BOS) booked 90 days out, across 47 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$3,317 to US$4,966. Every fare Altius recorded for trips booked 90 days out stayed close enough to what this route typically costs that none was flagged.
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.