Flight price alerts: San Francisco → London
Sample round trips on this route start around EUR 770; September 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 770. Cheapest month in our next-3-month sample: September 2026.
Set an alert and we email you when a round trip drops under your limit.
Set a price alertRound 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 .
- See deal
- Round trip · 7 nights
- Tue 01 Sept · 15:39
- Return Tue 08 Sept · 17:45
EUR 770
- See deal
- Round trip · 7 nights
- Thu 03 Sept · 16:30
- Return Thu 10 Sept · 06:00
EUR 898
| Depart | Return | Stay | Price | Book |
|---|---|---|---|---|
| Tue 01 Sept · 15:39 | Tue 08 Sept · 17:45 | 7 nights | EUR 770 | See deal |
| Thu 03 Sept · 16:30 | Thu 10 Sept · 06:00 | 7 nights | EUR 898 | See deal |
Frequently asked questions
- How do I get email alerts when San Francisco to London flights drop in price?
- Create a free FlexTrip Alerts tracker for San Francisco International Airport (SFO) to London (All Airports) (LON). Choose your flexible departure window, stay length, and maximum price — we email you when a round trip fits.
- Does FlexTrip Alerts book flights from San Francisco to London?
- 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 San Francisco to London 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 San Francisco to London 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 San Francisco to London?
- Based on recent fare samples on this page, September 2026 is currently the cheapest month to fly from San Francisco to London, with round trips from about EUR 770. Prices change — set an alert to catch the next drop.
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