Altius recorded 306 priced readings of nonstop business-class round trips from Boston (BOS) to Dublin (DUB) booked 90 days out, across 137 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$3,048 to US$9,105. The lowest fare Altius scored on this window was US$3,048 for a 2026-08-18 departure, seen on 2026-05-20 — STRONG at the time, 20.7% below the US$3,844 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.