Altius recorded 290 priced readings of nonstop business-class round trips from Miami (MIA) to Barcelona (BCN) booked 30 days out, across 134 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$4,380 to US$10,461. The lowest fare Altius scored on this window was US$4,380 for a 2026-08-09 departure, seen on 2026-07-10 — RARE at the time, 31.1% below the US$6,357 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.