Altius recorded 57 priced readings of nonstop business-class round trips from Rome (FCO) to Philadelphia (PHL) booked 30 days out, across 29 departure dates between 2026-08-19 and 2026-10-02. Observed fares ran from US$4,476 to US$12,411. The lowest fare Altius scored on this window was US$4,476 for a 2026-10-15 departure, seen on 2026-09-15 — RARE at the time, 32.2% below the US$6,602 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.