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.