Cheapest return flights from Seattle to San Salvador in December from 370€

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

Return flights

08 Dec - 21 Dec Frontier Airlines
24 Dec - 14 Jan Sun Country Airlines
05 Dec - 16 Dec Delta
19 Dec - 04 Jan Frontier Airlines
19 Dec - 02 Jan Frontier Airlines
22 Dec - 29 Dec Alaska Airlines
24 Dec - 02 Jan United

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

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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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