Altius recorded 313 priced readings of nonstop business-class round trips from Boston (BOS) to Frankfurt (FRA) booked 30 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$2,300 to US$11,618. The lowest fare Altius scored on this window was US$2,300 for a 2026-08-13 departure, seen on 2026-07-14 — RARE at the time, 32.7% below the US$3,418 this route was typically running that day.
Altius recorded 313 priced readings of nonstop business-class round trips from Boston (BOS) to Frankfurt (FRA) booked 60 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$2,820 to US$12,771. The lowest fare Altius scored on this window was US$2,820 for a 2026-08-11 departure, seen on 2026-06-12 — STRONG at the time, 19.9% below the US$3,521 this route was typically running that day.
Altius recorded 312 priced readings of nonstop business-class round trips from Boston (BOS) to Frankfurt (FRA) booked 90 days out, across 139 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$2,940 to US$10,821. The lowest fare Altius scored on this window was US$2,940 for a 2026-08-18 departure, seen on 2026-05-20 — LEGENDARY at the time, 54.8% below the US$6,504 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.