Altius recorded 305 priced readings of nonstop business-class round trips from Washington (IAD) to Rome (FCO) booked 90 days out, across 136 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$2,996 to US$12,156. The lowest fare Altius scored on this window was US$2,996 for a 2026-12-01 departure, seen on 2026-09-02 — RARE at the time, 37.4% below the US$4,786 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.