AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in December 2026 (see full year).
Return flights
| 29 Dec - 10 Jan | Aer Lingus | ||
| 15 Dec - 27 Dec | Lufthansa | ||
| 15 Dec - 27 Dec | Lufthansa | direct | |
| 29 Dec - 10 Jan | Iberia | direct | |
| 17 Dec - 27 Dec | Air Canada | ||
| 17 Dec - 27 Dec | British Airways | direct |
Also check the deals for one-way flights from San Francisco to London in December.
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