Altius recorded 248 priced readings of nonstop business-class round trips from London (LHR) to Lisbon (LIS) booked 30 days out, across 120 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$521 to US$962. The lowest fare Altius scored on this window was US$559 for a 2026-08-26 departure, seen on 2026-07-27 — DECENT at the time, 12.8% below the US$641 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.