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

Return flights

24 Aug - 08 Sep	United
29 Aug - 08 Sep	United
22 Aug - 06 Sep	American Airlines
27 Aug - 03 Sep	Avianca
22 Aug - 03 Sep	United
24 Aug - 08 Sep	Avianca	direct
20 Aug - 27 Aug	Copa
29 Aug - 01 Sep	Spirit Airlines
22 Aug - 01 Sep	Copa
22 Aug - 31 Aug	Spirit Airlines
17 Aug - 24 Aug	United
17 Aug - 02 Sep	Spirit Airlines
17 Aug - 28 Aug	Spirit Airlines
17 Aug - 18 Aug	Avianca
17 Aug - 18 Aug	Avianca	direct
17 Aug - 24 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 228€

Return flights