Altius recorded 307 priced readings of nonstop business-class round trips from Newark (EWR) to Porto (OPO) booked 90 days out, across 137 departure dates between 2026-05-20 and 2026-10-04. Observed fares ran from US$2,805 to US$12,759. The lowest fare Altius scored on this window was US$2,805 for a 2026-12-14 departure, seen on 2026-09-15 — IMPRESSIVE at the time, 23% below the US$3,643 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.