Flight price alerts: San Francisco → London
Sample round trips on this route start around EUR 662; 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 662. 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 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 · 6 nights
- Wed 21 Oct · 16:35
- Return Tue 27 Oct · 16:35
EUR 662
- See deal
- Round trip · 7 nights
- Thu 22 Oct · 16:30
- Return Thu 29 Oct · 16:00
EUR 662
- See deal
- Round trip · 5 nights
- Wed 21 Oct · 16:35
- Return Mon 26 Oct · 06:00
EUR 663
- See deal
- Round trip · 9 nights
- Tue 13 Oct · 08:10
- Return Thu 22 Oct · 09:25
EUR 671
- See deal
- Round trip · 7 nights
- Fri 16 Oct · 16:30
- Return Fri 23 Oct · 09:25
EUR 696
- See deal
- Round trip · 21 nights
- Fri 09 Oct · 14:15
- Return Fri 30 Oct · 12:20
EUR 750
- See deal
- Round trip · 8 nights
- Sat 21 Nov · 16:55
- Return Sun 29 Nov · 18:00
EUR 790
| Depart | Return | Stay | Price | Book |
|---|---|---|---|---|
| Wed 21 Oct · 16:35 | Tue 27 Oct · 16:35 | 6 nights | EUR 662 | See deal |
| Thu 22 Oct · 16:30 | Thu 29 Oct · 16:00 | 7 nights | EUR 662 | See deal |
| Wed 21 Oct · 16:35 | Mon 26 Oct · 06:00 | 5 nights | EUR 663 | See deal |
| Tue 13 Oct · 08:10 | Thu 22 Oct · 09:25 | 9 nights | EUR 671 | See deal |
| Fri 16 Oct · 16:30 | Fri 23 Oct · 09:25 | 7 nights | EUR 696 | See deal |
| Fri 09 Oct · 14:15 | Fri 30 Oct · 12:20 | 21 nights | EUR 750 | See deal |
| Sat 21 Nov · 16:55 | Sun 29 Nov · 18:00 | 8 nights | EUR 790 | 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, October 2026 is currently the cheapest month to fly from San Francisco to London, with round trips from about EUR 662. Prices change — set an alert to catch the next drop.
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