Altius recorded 309 priced readings of nonstop business-class round trips from Boston (BOS) to Dublin (DUB) booked 60 days out, across 138 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$2,886 to US$9,080. The lowest fare Altius scored on this window was US$2,886 for a 2026-09-05 departure, seen on 2026-07-07 — STRONG at the time, 20.7% below the US$3,639 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.