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

Return flights

01 Dec - 15 Dec	Air Canada
09 Dec - 15 Dec	Air Canada
02 Dec - 15 Dec	Air Canada
09 Dec - 23 Dec	Air Canada
09 Dec - 09 Jan	Air Canada
04 Dec - 07 Dec	Scandinavian Airlines
29 Dec - 24 Jan	TAP
06 Dec - 20 Dec	TAP
04 Dec - 10 Dec	British Airways
01 Dec - 27 Dec	TAP
06 Dec - 27 Dec	TAP
01 Dec - 05 Dec	TAP
10 Dec - 06 Jan	SWISS
15 Dec - 10 Jan	TAP
23 Dec - 05 Jan	Lufthansa
22 Dec - 17 Jan	Finnair
21 Dec - 13 Jan	American Airlines
11 Dec - 04 Jan	Flair Airlines
12 Dec - 05 Jan	British Airways
09 Dec - 03 Jan	Hawaiian Airlines

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 $410

Return flights