FlexTrip Alerts

Flight price alerts: London → San Francisco

Sample round trips on this route start around EUR 476; October 2026 is often the cheapest month in our next-3-month window. FlexTrip Alerts is a free email service — set flexible travel dates and a max price, and we notify you when a round trip fits. We check fares about four times per day; we do not sell tickets.

Set a free tracker with flexible dates and your max price. We email you only when a round trip fits.

Sample fares from EUR 476. Cheapest month in our next-3-month sample: October 2026.

Set an alert and we email you when a round trip drops under your limit.

Set a price alert

Round trips on this route

Cheapest-seen sample fares (next 3 months) — confirm the final price on the booking site when you click through.

Last updated .

  • Round trip · 12 nights
    Mon 19 Oct · 18:35
    Return Sat 31 Oct · 08:37

    EUR 476

    See deal
  • Round trip · 9 nights
    Thu 15 Oct · 07:25
    Return Sat 24 Oct · 08:28

    EUR 494

    See deal
  • Round trip · 2 nights
    Fri 02 Oct · 13:00
    Return Sun 04 Oct · 19:35

    EUR 514

    See deal
  • Round trip · 3 nights
    Fri 16 Oct · 15:05
    Return Mon 19 Oct · 16:30

    EUR 521

    See deal
  • Round trip · 4 nights
    Sat 03 Oct · 08:00
    Return Wed 07 Oct · 12:28

    EUR 548

    See deal
  • Round trip · 10 nights
    Fri 02 Oct · 13:00
    Return Mon 12 Oct · 19:35

    EUR 554

    See deal
  • Round trip · 9 nights
    Fri 16 Oct · 13:45
    Return Sun 25 Oct · 18:25

    EUR 560

    See deal
  • Round trip · 9 nights
    Mon 28 Sept · 14:05
    Return Wed 07 Oct · 08:10

    EUR 605

    See deal
  • Round trip · 4 nights
    Sun 11 Oct · 19:50
    Return Thu 15 Oct · 16:30

    EUR 811

    See deal
  • Round trip · 5 nights
    Fri 25 Sept · 17:00
    Return Wed 30 Sept · 15:26

    EUR 901

    See deal
  • Round trip · 7 nights
    Fri 25 Sept · 17:00
    Return Fri 02 Oct · 18:21

    EUR 999

    See deal

Frequently asked questions

How do I get email alerts when London to San Francisco flights drop in price?
Create a free FlexTrip Alerts tracker for London (All Airports) (LON) to San Francisco International Airport (SFO). Choose your flexible departure window, stay length, and maximum price — we email you when a round trip fits.
Does FlexTrip Alerts book flights from London to San Francisco?
No — we do not sell tickets. FlexTrip Alerts watches prices and emails you when a fare matches your plan. You book on the airline or travel site you prefer when you receive an alert.
Can I set flexible travel dates for London to San Francisco alerts?
Yes. Pick a departure window (not one fixed day) and how many nights you can stay. We match round trips that fit your window, stay length, and max price — then email you when one qualifies.
How often does FlexTrip Alerts check London to San Francisco fares?
We scan aggregated fares on a schedule — about four times per day (every ~6 hours, UTC). You can also trigger an on-demand check from your dashboard, with a short cooldown between manual refreshes.
What is the cheapest month to fly from London to San Francisco?
Based on recent fare samples on this page, October 2026 is currently the cheapest month to fly from London to San Francisco, with round trips from about EUR 476. Prices change — set an alert to catch the next drop.

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