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

Return flights

12 Dec - 22 Dec	Avianca	direct
06 Dec - 12 Dec	Alaska Airlines
19 Dec - 02 Jan	Avianca
26 Dec - 03 Jan	Avianca	direct
13 Dec - 03 Jan	Avianca	direct
19 Dec - 02 Jan	Avianca	direct
15 Dec - 06 Jan	Avianca
19 Dec - 11 Jan	Avianca	direct
15 Dec - 04 Jan	Alaska Airlines
12 Dec - 05 Jan	Avianca
15 Dec - 05 Jan	Avianca
20 Dec - 02 Jan	Alaska Airlines

Also check the deals for one-way flights from San Francisco to San Salvador 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 San Salvador in December from 354€

Return flights