$489 Cheap Finnair flights San Francisco (SFO) to London (LHR)

View $489 flight on Tue, Sep 23, 2025Opens in a new window

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$489 Cheap Finnair flights San Francisco (SFO) to London (LHR)

Prices were available within the past 7 days and start at $489 for one-way flights and $727 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Finnair
Tue, Sep 23 - Tue, Sep 30
SFO
San Francisco
LHR
London
$727 Roundtrip, just found
$727
Roundtrip
just found
Select Finnair flight, departing Tue, Sep 23 from San Francisco to London, returning Tue, Sep 30, priced at $727 just found
Flights from San Francisco (SFO) to London (LHR)
Origin airport
San Francisco Intl.
Destination airport
Heathrow
Airlines serving
Aer Lingus, Air Canada, Air France, Alaska Airlines, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic
Popular airline
Lufthansa
Distance
5354 mi
Average flight time
18 hours 22 mins

Frequently asked questions

How much is a Finnair flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
You can discover affordable return Finnair flights from $727 from SFO to LHR by sorting your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $489 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SFO to LHR with Finnair?
January is one of the cheapest months to jet away to London with Finnair. You could also find great deals on one-way and round-trip tickets in February.
What is the cheapest time to book flights from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR) with Finnair?
Look for Finnair flights from SFO to LHR about one month before you want to leave. The most affordable time to book an international flight is usually 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. No matter your ticket type or itinerary, the best day to book international airfare is usually Sunday. Friday can be the most expensive. Travelers booking on a Sunday can save 17% on average compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Finnair fly nonstop from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Enter your dates, press search and tick the "Nonstop" filter on Expedia to find any direct flights from SFO to LHR with Finnair or other carriers.
What is the earliest Finnair flight from SFO to LHR?
To find the earliest departures from SFO to LHR with Finnair, filter your results by "Morning" and "Early Morning." Choosing an early flight usually means you'll experience fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Finnair fly into in London?
Heathrow Airport (LHR) is the main London hub for Finnair flights from San Francisco Intl. Airport (SFO).
What kind of luggage can I take on a Finnair flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Finnair lets passengers bring 1 checked-in bag weighing up to 50 lb with dimensions not exceeding 62 inches on standard economy flights from SFO to LHR. You can also bring 1 cabin bag in the cabin. This carry-on luggage must not exceed 9 inches x 15 inches x 15 inches and weigh less than 22 lb. Baggage policies can differ based on the fare type and cabin class, so check your booking or Finnair's website to avoid unexpected fees at the airport.
Why fly with Finnair from SFO to LHR?
With a 4-star airline rating and a rewarding loyalty program, Finnair is the leading choice for many travelers flying from SFO to LHR. Plus, if you're a Finnair Plus and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be spent on future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Finnair flight from San Francisco Intl. Airport (SFO) to Heathrow Airport (LHR)?
Depending on your ticket type, a fee typically applies if you modify or cancel your flight more than 24 hours after it has been confirmed. To secure flexible fares, select our "Changes included" and "No cancel fee" boxes when you look for flights. For more details on changing or canceling your reservation, head to "Trips," select your flight and click on "Manage Booking."

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*Available to One Key members.