Altius recorded 298 priced readings of nonstop business-class round trips from Chicago (ORD) to Rome (FCO) booked 90 days out, across 133 departure dates between 2026-05-20 and 2026-09-30. Observed fares ran from US$3,392 to US$10,341. The lowest fare Altius scored on this window was US$3,392 for a 2026-08-18 departure, seen on 2026-05-20 — RARE at the time, 36.6% below the US$5,350 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.