Altius recorded 308 priced readings of nonstop business-class round trips from Chicago (ORD) to Barcelona (BCN) booked 30 days out, across 137 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$3,834 to US$20,336. The lowest fare Altius scored on this window was US$6,510 for a 2026-10-31 departure, seen on 2026-10-01 — IMPRESSIVE at the time, 28% below the US$9,042 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.