Altius recorded 145 priced readings of nonstop business-class round trips from San Francisco (SFO) to Chicago (ORD) booked 60 days out, across 73 departure dates between 2026-07-25 and 2026-10-05. Observed fares ran from US$1,017 to US$1,828. The lowest fare Altius scored on this window was US$1,017 for a 2026-10-17 departure, seen on 2026-08-18 — STRONG at the time, 20.5% below the US$1,279 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.