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

Return flights

29 Aug - 08 Sep	Copa
29 Aug - 08 Sep	Avianca	direct
22 Aug - 03 Sep	United
03 Aug - 14 Aug	Spirit Airlines
22 Aug - 03 Sep	Avianca	direct
04 Aug - 15 Aug	Spirit Airlines
11 Aug - 17 Aug	Spirit Airlines
02 Aug - 17 Aug	Spirit Airlines
18 Aug - 30 Aug	Spirit Airlines
03 Aug - 11 Aug	American Airlines
22 Aug - 01 Sep	American Airlines
02 Aug - 10 Aug	Spirit Airlines
09 Aug - 16 Aug	Allegiant Air
22 Aug - 01 Sep	Avianca	direct
08 Aug - 16 Aug	Spirit Airlines
03 Aug - 11 Aug	Avianca	direct

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 $244

Return flights