Cheapest return flights from Washington to San Salvador in December from $323

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

Return flights

30 Dec - 16 Jan Frontier Airlines
29 Dec - 15 Jan Frontier Airlines
30 Dec - 17 Jan Frontier Airlines
31 Dec - 13 Jan Frontier Airlines
31 Dec - 13 Jan Avianca direct
27 Dec - 17 Jan Frontier Airlines
30 Dec - 07 Jan Frontier Airlines
31 Dec - 12 Jan Avianca direct
29 Dec - 12 Jan Frontier Airlines
31 Dec - 07 Jan Avianca
26 Dec - 29 Dec Frontier Airlines
31 Dec - 31 Dec Avianca direct
28 Dec - 31 Dec Frontier Airlines
29 Dec - 31 Dec Frontier Airlines direct
26 Dec - 31 Dec Frontier Airlines
25 Dec - 28 Dec Frontier Airlines direct
26 Dec - 30 Dec Frontier Airlines
25 Dec - 27 Dec Frontier Airlines direct
27 Dec - 31 Dec Frontier Airlines direct
25 Dec - 30 Dec American Airlines

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

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