Altius recorded 89 priced readings of nonstop business-class round trips from Rome (FCO) to Detroit (DTW) booked 60 days out, across 45 departure dates between 2026-08-19 and 2026-10-04. Observed fares ran from US$4,765 to US$9,823. The lowest fare Altius scored on this window was US$4,765 for a 2026-11-16 departure, seen on 2026-09-17 — RARE at the time, 32.2% below the US$7,028 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.