Altius recorded 173 priced readings of nonstop business-class round trips from London (LHR) to Sofia (SOF) booked 90 days out, across 84 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$621 to US$1,485. The lowest fare Altius scored on this window was US$621 for a 2026-11-09 departure, seen on 2026-08-11 — IMPRESSIVE at the time, 24.6% below the US$824 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.