Altius recorded 247 priced readings of nonstop business-class round trips from Boston (BOS) to Rome (FCO) booked 90 days out, across 108 departure dates between 2026-05-20 and 2026-10-05. Observed fares ran from US$3,455 to US$11,001. The lowest fare Altius scored on this window was US$3,455 for a 2026-11-25 departure, seen on 2026-08-27 — RARE at the time, 30.2% below the US$4,950 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.