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

Return flights

03 Dec - 10 Dec	TAP
08 Dec - 15 Dec	TAP
08 Dec - 22 Dec	TAP
29 Dec - 12 Jan	TAP
07 Dec - 23 Dec	Air Canada
11 Dec - 25 Dec	SWISS
26 Dec - 30 Dec	TAP
23 Dec - 06 Jan	Air Canada
29 Dec - 06 Jan	Air Canada
29 Dec - 05 Jan	British Airways
11 Dec - 26 Dec	Air Canada
08 Dec - 28 Dec	Scandinavian Airlines
20 Dec - 24 Dec	Air Canada
12 Dec - 28 Dec	Lufthansa
17 Dec - 07 Jan	TAP
17 Dec - 04 Jan	TAP
28 Dec - 04 Jan	United
19 Dec - 03 Jan	Air Canada

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

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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Cheapest return flights from San Francisco to Barcelona in December from $402

Return flights