AirHint found the following cheapest one-way flights from Boston (BOS) to San Salvador (SAL) in December 2025 (see full year).
One-Way flights
| 31 Dec | United | ||
| 25 Dec | Spirit Airlines | ||
| 24 Dec | Frontier Airlines | ||
| 27 Dec | Frontier Airlines | ||
| 21 Dec | Frontier Airlines | ||
| 26 Dec | Spirit Airlines | ||
| 21 Dec | Avianca | direct |
Also check the deals for return flights from Boston 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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