Cheapest return flights from Seattle to San Salvador in March from $500

AirHint found the following cheapest return flights from Seattle (SEA) to San Salvador (SAL) in March 2026 (see full year).

Return flights

31 Mar - 13 Apr Frontier Airlines
05 Mar - 12 Mar Alaska Airlines
22 Mar - 01 Apr Hawaiian Airlines
21 Mar - 01 Apr Frontier Airlines
13 Mar - 20 Mar Frontier Airlines
06 Mar - 12 Mar Frontier Airlines
21 Mar - 26 Mar Frontier Airlines
22 Mar - 28 Mar Frontier Airlines
21 Mar - 30 Mar Frontier Airlines
21 Mar - 28 Mar Alaska Airlines
21 Mar - 27 Mar Delta
22 Mar - 27 Mar Delta
28 Mar - 28 Mar United

Also check the deals for one-way flights from Seattle to San Salvador in March.

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