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

Return flights

26 Aug - 09 Sep	Spirit Airlines
29 Aug - 08 Sep	United
28 Aug - 09 Sep	Spirit Airlines
28 Aug - 16 Sep	Spirit Airlines
29 Aug - 10 Sep	United
29 Aug - 12 Sep	Lufthansa
28 Aug - 02 Sep	Copa
22 Aug - 03 Sep	American Airlines
27 Aug - 03 Sep	Avianca
21 Aug - 28 Aug	Copa
29 Aug - 03 Sep	Spirit Airlines
27 Aug - 31 Aug	Spirit Airlines
19 Aug - 26 Aug	Aeromexico
26 Aug - 28 Aug	Spirit Airlines
20 Aug - 27 Aug	Spirit Airlines
18 Aug - 30 Aug	Copa
22 Aug - 31 Aug	Copa
19 Aug - 28 Aug	Spirit Airlines
21 Aug - 26 Aug	Spirit Airlines
22 Aug - 29 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 $257

Return flights