Altius recorded 303 priced readings of nonstop business-class round trips from Washington (IAD) to Rome (FCO) booked 30 days out, across 135 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$3,451 to US$10,895. The lowest fare Altius scored on this window was US$3,451 for a 2026-08-05 departure, seen on 2026-07-06 — STRONG at the time, 15.7% below the US$4,094 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.