Altius recorded 144 priced readings of nonstop business-class round trips from Boston (BOS) to San Diego (SAN) booked 60 days out, across 72 departure dates between 2026-07-25 and 2026-10-04. Observed fares ran from US$1,027 to US$2,536. The lowest fare Altius scored on this window was US$1,123 for a 2026-10-30 departure, seen on 2026-08-31 — IMPRESSIVE at the time, 23.2% below the US$1,462 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.