Flight price alerts: London → San Francisco
Sample round trips on this route start around EUR 556; 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 556. 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 · 29 nights
- Tue 01 Sept · 18:40
- Return Wed 30 Sept · 12:35
EUR 556
- See deal
- Round trip · 6 nights
- Sat 05 Sept · 08:30
- Return Fri 11 Sept · 16:45
EUR 557
- See deal
- Round trip · 6 nights
- Sat 12 Sept · 09:30
- Return Fri 18 Sept · 08:10
EUR 582
- See deal
- Round trip · 8 nights
- Mon 31 Aug · 06:30
- Return Tue 08 Sept · 11:10
EUR 667
- See deal
- Round trip · 11 nights
- Fri 28 Aug · 08:40
- Return Tue 08 Sept · 19:35
EUR 673
- See deal
- Round trip · 5 nights
- Mon 21 Sept · 07:30
- Return Sat 26 Sept · 08:30
EUR 702
- See deal
- Round trip · 7 nights
- Fri 28 Aug · 11:10
- Return Fri 04 Sept · 07:00
EUR 703
- See deal
- Round trip · 4 nights
- Sat 26 Sept · 08:55
- Return Wed 30 Sept · 11:02
EUR 710
- See deal
- Round trip · 11 nights
- Sat 22 Aug · 06:00
- Return Wed 02 Sept · 08:10
EUR 719
- See deal
- Round trip · 6 nights
- Mon 10 Aug · 16:25
- Return Sun 16 Aug · 08:45
EUR 754
| Depart | Return | Stay | Price | Book |
|---|---|---|---|---|
| Tue 01 Sept · 18:40 | Wed 30 Sept · 12:35 | 29 nights | EUR 556 | See deal |
| Sat 05 Sept · 08:30 | Fri 11 Sept · 16:45 | 6 nights | EUR 557 | See deal |
| Sat 12 Sept · 09:30 | Fri 18 Sept · 08:10 | 6 nights | EUR 582 | See deal |
| Mon 31 Aug · 06:30 | Tue 08 Sept · 11:10 | 8 nights | EUR 667 | See deal |
| Fri 28 Aug · 08:40 | Tue 08 Sept · 19:35 | 11 nights | EUR 673 | See deal |
| Mon 21 Sept · 07:30 | Sat 26 Sept · 08:30 | 5 nights | EUR 702 | See deal |
| Fri 28 Aug · 11:10 | Fri 04 Sept · 07:00 | 7 nights | EUR 703 | See deal |
| Sat 26 Sept · 08:55 | Wed 30 Sept · 11:02 | 4 nights | EUR 710 | See deal |
| Sat 22 Aug · 06:00 | Wed 02 Sept · 08:10 | 11 nights | EUR 719 | See deal |
| Mon 10 Aug · 16:25 | Sun 16 Aug · 08:45 | 6 nights | EUR 754 | 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, September 2026 is currently the cheapest month to fly from London to San Francisco, with round trips from about EUR 556. Prices change — set an alert to catch the next drop.
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