Cheapest one-way flights from Boston to San Salvador in December from 154€

AirHint found the following cheapest one-way flights from Boston (BOS) to San Salvador (SAL) in December 2025 (see full year).

One-Way flights

15 Dec Frontier Airlines
14 Dec Spirit Airlines
16 Dec Spirit Airlines
12 Dec Spirit Airlines
27 Dec Frontier Airlines
24 Dec Spirit Airlines
19 Dec Spirit Airlines
21 Dec Spirit Airlines
20 Dec Spirit Airlines
23 Dec Spirit Airlines

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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