AirHint found the following cheapest return flights from Washington (IAD) to San Salvador (SAL) in September 2025 (see full year).

Return flights

02 Sep - 11 Sep	Avianca	direct
23 Sep - 30 Sep	Avianca	direct
27 Sep - 29 Sep	Avianca	direct
20 Sep - 29 Sep	Avianca	direct
20 Sep - 30 Sep	Avianca	direct
27 Sep - 30 Sep	Avianca	direct
07 Sep - 16 Sep	Avianca	direct
24 Sep - 29 Sep	Avianca	direct
08 Sep - 18 Sep	Avianca	direct
10 Sep - 18 Sep	Avianca	direct
24 Sep - 01 Oct	Avianca	direct
26 Sep - 05 Oct	Avianca	direct
25 Sep - 04 Oct	Avianca	direct
30 Sep - 14 Oct	Avianca	direct
04 Sep - 02 Oct	Avianca	direct
24 Sep - 22 Oct	Avianca	direct
05 Sep - 01 Oct	Volaris El Salvador	direct

Also check the deals for one-way flights from Washington to San Salvador in September.

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 Washington to San Salvador in September from $176

Return flights