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

Return flights

01 Dec - 10 Dec	Copa
14 Dec - 21 Dec	Avianca
08 Dec - 15 Dec	Avianca
07 Dec - 28 Dec	Avianca
12 Dec - 15 Dec	Copa
08 Dec - 12 Dec	Avianca
10 Dec - 15 Dec	Avianca	direct
12 Dec - 15 Dec	Avianca	direct
14 Dec - 08 Jan	Avianca	direct
15 Dec - 22 Dec	Avianca	direct
15 Dec - 08 Jan	Avianca	direct
24 Dec - 16 Jan	Avianca
15 Dec - 29 Dec	Avianca	direct
13 Dec - 08 Jan	Avianca	direct
24 Dec - 10 Jan	Avianca	direct
15 Dec - 07 Jan	Avianca	direct
24 Dec - 07 Jan	Avianca	direct
23 Dec - 10 Jan	Avianca	direct
26 Dec - 07 Jan	Avianca	direct
23 Dec - 12 Jan	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 219€

Return flights