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

Return flights

08 Dec - 14 Dec	Avianca	direct
01 Dec - 07 Dec	Avianca	direct
30 Dec - 15 Jan	Copa
27 Dec - 18 Jan	American Airlines
26 Dec - 23 Jan	Avianca	direct
27 Dec - 18 Jan	Avianca	direct
15 Dec - 25 Dec	Avianca	direct
18 Dec - 15 Jan	Avianca	direct
25 Dec - 12 Jan	American Airlines
17 Dec - 16 Jan	Avianca	direct
21 Dec - 29 Dec	American Airlines
23 Dec - 13 Jan	Avianca
19 Dec - 23 Jan	Avianca	direct
27 Dec - 10 Jan	Copa
21 Dec - 29 Dec	Avianca	direct
20 Dec - 28 Dec	Avianca	direct

Also check the deals for one-way flights from Washington 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 Washington to San Salvador in December from $278

Return flights