Altius recorded 276 priced readings of nonstop business-class round trips from Boston (BOS) to Barcelona (BCN) booked 30 days out, across 120 departure dates between 2026-05-20 and 2026-09-17. Observed fares ran from US$2,709 to US$15,405. The lowest fare Altius scored on this window was US$2,709 for a 2026-07-21 departure, seen on 2026-06-21 — STRONG at the time, 18.5% below the US$3,324 this route was typically running that day.
Altius recorded 218 priced readings of nonstop business-class round trips from Boston (BOS) to Barcelona (BCN) booked 60 days out, across 91 departure dates between 2026-05-20 and 2026-08-18. Observed fares ran from US$2,733 to US$7,432. The lowest fare Altius scored on this window was US$2,733 for a 2026-08-22 departure, seen on 2026-06-23 — IMPRESSIVE at the time, 29.1% below the US$3,855 this route was typically running that day. Altius has not seen a nonstop business-class round trip on this route since 2026-08-18. The record above is what was observed while fares were being returned. Routes drop out of schedules and come back, so it is worth checking again.
Altius recorded 166 priced readings of nonstop business-class round trips from Boston (BOS) to Barcelona (BCN) booked 90 days out, across 66 departure dates between 2026-05-20 and 2026-07-24. Observed fares ran from US$3,199 to US$10,105. The lowest fare Altius scored on this window was US$3,199 for a 2026-09-29 departure, seen on 2026-07-01 — RARE at the time, 30.6% below the US$4,610 this route was typically running that day. Altius has not seen a nonstop business-class round trip on this route since 2026-07-24. The record above is what was observed while fares were being returned. Routes drop out of schedules and come back, so it is worth checking again.
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.