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

Return flights

30 Dec - 30 Jan	Frontier Airlines
06 Dec - 12 Dec	Avianca	direct
31 Dec - 22 Jan	United
08 Dec - 20 Jan	Frontier Airlines
23 Dec - 23 Jan	Frontier Airlines
03 Dec - 10 Dec	Avianca	direct
09 Dec - 16 Dec	American Airlines
05 Dec - 10 Dec	Avianca	direct
08 Dec - 05 Jan	Frontier Airlines
10 Dec - 06 Jan	Frontier Airlines
09 Dec - 16 Dec	Avianca	direct
08 Dec - 20 Jan	Avianca	direct
29 Dec - 26 Jan	Avianca	direct
30 Dec - 30 Jan	Avianca	direct
30 Dec - 26 Jan	Avianca	direct
05 Dec - 09 Dec	Avianca	direct
05 Dec - 14 Dec	Avianca	direct
23 Dec - 30 Dec	Frontier Airlines
17 Dec - 31 Dec	Avianca	direct
23 Dec - 30 Dec	Avianca	direct

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 $399

Return flights