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

Return flights

02 Dec - 09 Dec	Air France
03 Dec - 10 Dec	KLM
09 Dec - 16 Dec	Air France
10 Dec - 17 Dec	British Airways
03 Dec - 12 Dec	KLM
10 Dec - 24 Dec	Air Canada
01 Dec - 08 Dec	British Airways
08 Dec - 15 Dec	British Airways
01 Dec - 15 Dec	British Airways
05 Dec - 12 Dec	TAP
29 Dec - 24 Jan	TAP
11 Dec - 18 Jan	Delta
30 Dec - 06 Jan	SWISS
31 Dec - 07 Jan	SWISS
15 Dec - 10 Jan	TAP
29 Dec - 05 Jan	SWISS
30 Dec - 05 Jan	SWISS
23 Dec - 08 Jan	SWISS
22 Dec - 17 Jan	Austrian Airlines
23 Dec - 06 Jan	Delta

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 369€

Return flights