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

Return flights

06 Dec - 14 Dec	TAP
01 Dec - 13 Dec	TAP
03 Dec - 24 Dec	Air Canada
09 Dec - 16 Dec	United
06 Dec - 20 Dec	TAP
11 Dec - 18 Dec	United
24 Dec - 31 Dec	Air Canada
10 Dec - 31 Dec	Air Canada
29 Dec - 05 Jan	British Airways
16 Dec - 23 Dec	Air Canada
25 Dec - 08 Jan	Lufthansa
26 Dec - 10 Jan	Lufthansa
16 Dec - 30 Dec	United
22 Dec - 05 Jan	British Airways
12 Dec - 02 Jan	TAP
28 Dec - 04 Jan	British Airways
24 Dec - 03 Jan	British Airways
23 Dec - 03 Jan	British Airways
23 Dec - 04 Jan	British Airways
12 Dec - 03 Jan	TAP

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 353€

Return flights