AirHint found the following cheapest return flights from St. Petersburg (PIE) to San Salvador (SAL) in December 2025 (see full year).
Return flights
| 20 Dec - 02 Jan | Allegiant Air | ||
| 20 Dec - 03 Jan | Allegiant Air | ||
| 04 Dec - 10 Dec | Allegiant Air |
Also check the deals for one-way flights from St. Petersburg to San Salvador in December.
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