The cheapest Lisbon to San Francisco return flight on the radar right now is €950, flying with SWISS + Air Canada + Lufthansa via one or more connections. It covers departures in November 2026, and every dated link below opens that exact LIS–SFO search on Skyscanner. The price we usually record on this route is €727. Across 96 recorded checks it has ranged between €425 and €953. Our sampling points to November 2026 as the cheapest month to fly Lisbon to San Francisco.

We do not post a price and leave it to age. Each fare is re-checked against Skyscanner on a schedule and carries the time it was last confirmed. Not flying from Lisbon? We track 60 other departure cities for San Francisco, listed at the foot of this page.

Cheap fares do not hang around. If this one has already gone, nudge the dates either way by a day or two; Lisbon to San Francisco is usually still decent value around the same window.