AirHint found the following cheapest return flights from Boston (BOS) to San Salvador (SAL) in August 2025 (see full year).

Return flights

11 Aug - 19 Aug	Spirit Airlines
06 Aug - 19 Aug	Spirit Airlines
12 Aug - 24 Aug	Spirit Airlines
22 Aug - 03 Sep	Spirit Airlines
09 Aug - 19 Aug	Spirit Airlines
11 Aug - 24 Aug	Spirit Airlines
06 Aug - 10 Aug	Spirit Airlines
22 Aug - 01 Sep	Spirit Airlines
06 Aug - 24 Aug	Spirit Airlines
18 Aug - 30 Aug	Spirit Airlines
05 Aug - 19 Aug	Spirit Airlines
29 Aug - 08 Sep	Avianca
01 Aug - 08 Aug	Spirit Airlines

Also check the deals for one-way flights from Boston to San Salvador in August.

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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Cheapest return flights from Boston to San Salvador in August from 268€

Return flights