Altius recorded 88 priced readings of nonstop business-class round trips from Rome (FCO) to Philadelphia (PHL) booked 90 days out, across 44 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$3,526 to US$10,705. The lowest fare Altius scored on this window was US$4,272 for a 2026-12-03 departure, seen on 2026-09-04 — STRONG at the time, 16.1% below the US$5,092 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.