Altius recorded 303 priced readings of nonstop business-class round trips from Boston (BOS) to Zurich (ZRH) booked 60 days out, across 136 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$3,937 to US$10,623. The lowest fare Altius scored on this window was US$3,937 for a 2026-09-02 departure, seen on 2026-07-04 — STRONG at the time, 18.8% below the US$4,849 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.