Altius recorded 307 priced readings of nonstop business-class round trips from Washington (IAD) to Dublin (DUB) booked 60 days out, across 137 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$3,463 to US$6,445. The lowest fare Altius scored on this window was US$3,463 for a 2026-09-05 departure, seen on 2026-07-07 — IMPRESSIVE at the time, 23.6% below the US$4,533 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.