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

Return flights

05 Dec - 19 Dec	United	direct
09 Dec - 16 Dec	Avianca	direct
10 Dec - 23 Jan	Copa
09 Dec - 23 Jan	Copa
11 Dec - 23 Jan	Copa
26 Dec - 30 Dec	Avianca
26 Dec - 31 Jan	Avianca	direct
26 Dec - 30 Dec	Avianca	direct
15 Dec - 25 Dec	Copa
28 Dec - 13 Jan	Copa
28 Dec - 13 Jan	Avianca	direct
17 Dec - 22 Dec	Copa
17 Dec - 15 Jan	Copa
22 Dec - 29 Dec	Copa
08 Dec - 06 Jan	Copa
15 Dec - 25 Dec	United	direct
20 Dec - 31 Dec	Avianca	direct
22 Dec - 31 Dec	Copa
24 Dec - 08 Jan	Copa
23 Dec - 07 Jan	Copa

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 286€

Return flights