Cheapest return flights from San Francisco to London in December from $660

Best time to book flights for San Francisco (SFO) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in December 2025 (see full year).

Return flights

10 Dec - 30 Dec Air Canada
23 Dec - 21 Jan Air Canada
23 Dec - 22 Jan Air Canada
23 Dec - 09 Jan Air Canada
22 Dec - 21 Jan Air Canada
10 Dec - 30 Dec Finnair direct
12 Dec - 19 Dec United direct
23 Dec - 09 Jan Iberia direct
22 Dec - 02 Jan Air Canada
22 Dec - 29 Dec United
22 Dec - 29 Dec British Airways direct
25 Dec - 02 Jan Air Canada
22 Dec - 04 Jan TAP
20 Dec - 27 Dec American Airlines
20 Dec - 27 Dec British Airways direct
25 Dec - 02 Jan United direct

Also check the deals for one-way flights from San Francisco to London in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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