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 - 19 Dec	Alaska Airlines
12 Dec - 19 Dec	Avianca	direct
04 Dec - 08 Dec	Avianca	direct
02 Dec - 09 Dec	Avianca	direct
25 Dec - 06 Jan	Alaska Airlines
17 Dec - 31 Dec	Sun Country Airlines
12 Dec - 15 Dec	Avianca	direct
06 Dec - 31 Dec	Avianca	direct
11 Dec - 22 Dec	Avianca	direct
13 Dec - 22 Dec	Avianca	direct
17 Dec - 31 Dec	Avianca	direct
25 Dec - 06 Jan	Avianca	direct
19 Dec - 04 Jan	Frontier Airlines
23 Dec - 02 Jan	Avianca
30 Dec - 13 Jan	Avianca	direct
18 Dec - 14 Jan	Avianca	direct
25 Dec - 10 Jan	Avianca	direct
23 Dec - 06 Jan	Avianca	direct
22 Dec - 08 Jan	Avianca	direct
20 Dec - 12 Jan	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 $606

Return flights