AirHint found the following cheapest return flights from Seattle (SEA) to San Salvador (SAL) in October 2025 (see full year).
Return flights
| 31 Oct - 07 Nov | Frontier Airlines | ||
| 24 Oct - 14 Nov | Frontier Airlines | ||
| 25 Oct - 29 Oct | Frontier Airlines | ||
| 29 Oct - 01 Nov | Frontier Airlines |
Also check the deals for one-way flights from Seattle to San Salvador in October.
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