Flights from Lisbon to San Francisco

The cheapest round-trip from Lisbon to San Francisco is about 644 EUR, usually in September 2026; June 2026 is priciest, so booking the low month saves around 134 EUR (~17%). Typical fare ~652 EUR, from 330 priced fares. Flightmussy live data, updated 2026-06-13.

Cheap flights from Lisbon (LIS) to San Francisco (SFO/OAK/SJC). Free, no signup, no ads, no tracking. Compare every airline across 12 months of fares on one heatmap — including low-cost carriers Google Flights often deprioritises.

Fare insights: Lisbon to San Francisco

Cheapest round-trip seen: 644 EUR, usually around September 2026. Typical fare ~652 EUR. Across the year prices range roughly 644–778 EUR — about 17% cheaper in the low season than the peak (June 2026). Carriers on this route include American, KLM, British Airways, Air France.

Based on Flightmussy's live 12-month fare data; prices last updated 2026-06-13. Prices change constantly — search live for current fares.

Cheapest fare by month: Lisbon to San Francisco

The lowest round-trip fare we found for each month over the coming year — low season versus peak at a glance. September 2026 is cheapest; June 2026 is priciest.

Jun 2026778 EUR
Jul 2026748 EUR
Aug 2026659 EUR
Sep 2026644 EUR
Oct 2026649 EUR
Nov 2026649 EUR
Dec 2026649 EUR
Jan 2027649 EUR
Feb 2027649 EUR
Mar 2027658 EUR
Apr 2027659 EUR
May 2027656 EUR

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Frequently asked questions

What is the cheapest month to fly from Lisbon to San Francisco?
The cheapest round-trip fares from Lisbon to San Francisco start around 644 EUR and are typically lowest in September 2026; June 2026 is the most expensive. Fares swing about 17% across the year. (Flightmussy live data, updated 2026-06-13.)
How much does a flight from Lisbon to San Francisco typically cost?
Typical round-trip is ~652 EUR; across the year fares run 644–778 EUR, cheapest 644 EUR in September 2026. Based on 330 priced fares, updated 2026-06-13.
How much can I save flying Lisbon to San Francisco in the cheapest month?
Booking the September 2026 low instead of the June 2026 peak saves about 134 EUR (~17%) per round-trip. Updated 2026-06-13.
Which airlines fly from Lisbon to San Francisco?
Carriers seen on Lisbon → San Francisco in recent searches: American, KLM, British Airways, Air France. Flightmussy compares every carrier serving Lisbon → San Francisco, including budget airlines like Ryanair, easyJet, Wizz Air and AirAsia that Google Flights often deprioritises.
Do I need to sign up to search flights from Lisbon to San Francisco?
No. Flightmussy is free and requires no account, no email, and no credit card. Search, compare, and click through to book directly with the airline or booking partner.

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About Flightmussy

Flightmussy is a free, independent flight search for travellers anywhere in the world. No signup, no ads, no tracking — email is optional, only for route price alerts. Compare fares across every airline and see 12 months of prices at a glance, including the low-cost carriers Google Flights often buries. Book directly with the airline or a trusted partner — we never add a markup.

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Flightmussy runs its own 12-month forward fare scans across thousands of routes worldwide and publishes the data openly. Read the cheapest month to fly almost anywhere → — a global study of when fares are lowest — or browse the cheapest destinations from a city:

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