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

Return flights

31 Dec - 22 Jan	United
06 Dec - 12 Dec	United
07 Dec - 12 Dec	Hawaiian Airlines
02 Dec - 06 Dec	United
05 Dec - 07 Dec	Avianca	direct
02 Dec - 06 Dec	Avianca	direct
15 Dec - 15 Jan	Frontier Airlines
15 Dec - 13 Jan	jetBlue
23 Dec - 08 Jan	Sun Country Airlines
15 Dec - 04 Jan	Hawaiian Airlines
15 Dec - 13 Jan	Avianca	direct
19 Dec - 16 Jan	Frontier Airlines
17 Dec - 30 Dec	Hawaiian Airlines
19 Dec - 16 Jan	Avianca	direct
22 Dec - 29 Dec	Hawaiian Airlines
17 Dec - 03 Jan	Hawaiian Airlines
18 Dec - 03 Jan	Frontier 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 378€

Return flights