AirHint found the following cheapest return flights from Philadelphia (PHL) to San Salvador (SAL) in December 2025 (see full year).
Return flights
| 04 Dec - 08 Dec | Spirit Airlines | ||
| 04 Dec - 11 Dec | Spirit Airlines | ||
| 07 Dec - 11 Dec | Spirit Airlines | ||
| 27 Dec - 04 Jan | Frontier Airlines |
Also check the deals for one-way flights from Philadelphia to San Salvador in December.
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