Altius recorded 91 priced readings of nonstop business-class round trips from Rome (FCO) to Washington (IAD) booked 30 days out, across 46 departure dates between 2026-08-19 and 2026-10-05. Observed fares ran from US$4,543 to US$7,978. The lowest fare Altius scored on this window was US$4,543 for a 2026-11-01 departure, seen on 2026-10-02 — STRONG at the time, 20.1% below the US$5,686 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.