Altius recorded 251 priced readings of nonstop business-class round trips from London (LHR) to Lisbon (LIS) booked 90 days out, across 121 departure dates between 2026-06-06 and 2026-10-04. Observed fares ran from US$445 to US$716. The lowest fare Altius scored on this window was US$445 for a 2026-09-22 departure, seen on 2026-06-24 — RARE at the time, 32.1% below the US$655 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.