Altius recorded 144 priced readings of nonstop business-class round trips from San Francisco (SFO) to Boston (BOS) booked 60 days out, across 72 departure dates between 2026-07-25 and 2026-10-04. Observed fares ran from US$1,272 to US$3,088. The lowest fare Altius scored on this window was US$1,272 for a 2026-11-14 departure, seen on 2026-09-15 — IMPRESSIVE at the time, 27.4% below the US$1,752 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.