Cheap flights from London to San Francisco
Cheapest return fare right now: £4319 Dec – 25 Dec · Alaska Airlines
- Direct flights
- No
- Typical flight time
- 11 h 10 min
- Price range seen
- £431 – £559
- Cheapest month (next 3 months)
- December 2026
Best dates
| Dates | Nights | Airline | Stops | From | Price | |
|---|---|---|---|---|---|---|
| 9 Dec – 25 Dec | 16 | Alaska Airlines | 1 | London Heathrow | £431 | Book → |
| 12 Dec – 25 Dec | 13 | American Airlines | 1 | London Heathrow | £545 | Book → |
| 4 Dec – 15 Dec | 11 | British Airways | 1 | London Heathrow | £558 | Book → |
| 1 Nov – 22 Nov | 21 | Alaska Airlines | 1 | London Heathrow | £559 | Book → |
Prices checked on 23 October 2026.
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