Altius recorded 79 priced readings of nonstop business-class round trips from Rome (FCO) to Philadelphia (PHL) booked 60 days out, across 40 departure dates between 2026-08-19 and 2026-10-05. Observed fares ran from US$3,442 to US$12,473. The lowest fare Altius scored on this window was US$3,442 for a 2026-11-23 departure, seen on 2026-09-24 — LEGENDARY at the time, 48.2% below the US$6,645 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.