Altius recorded 75 priced readings of nonstop business-class round trips from Rome (FCO) to Detroit (DTW) booked 30 days out, across 39 departure dates between 2026-08-21 and 2026-10-04. Observed fares ran from US$4,811 to US$10,682. The lowest fare Altius scored on this window was US$4,811 for a 2026-10-02 departure, seen on 2026-09-02 — RARE at the time, 42.2% below the US$8,324 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.