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

Return flights

08 Dec - 11 Dec	Frontier Airlines
08 Dec - 11 Dec	Avianca	direct
08 Dec - 29 Dec	Avianca	direct
03 Dec - 11 Dec	Avianca	direct
04 Dec - 09 Dec	Avianca	direct
03 Dec - 08 Dec	Avianca	direct
07 Dec - 10 Dec	Allegiant Air
09 Dec - 13 Dec	Avianca	direct
14 Dec - 19 Dec	Avianca	direct
11 Dec - 18 Dec	Avianca	direct
30 Dec - 31 Jan	Avianca	direct
30 Dec - 24 Jan	Avianca	direct
30 Dec - 15 Jan	Avianca	direct
28 Dec - 15 Jan	Avianca	direct
30 Dec - 17 Jan	Avianca
13 Dec - 18 Jan	Avianca	direct
27 Dec - 23 Jan	Avianca	direct
30 Dec - 07 Jan	Avianca
30 Dec - 17 Jan	Avianca	direct
27 Dec - 18 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 $248

Return flights