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

Return flights

15 Sep - 23 Sep	Volaris El Salvador	direct
04 Sep - 23 Sep	Volaris El Salvador	direct
10 Sep - 15 Sep	Delta
30 Sep - 01 Oct	Delta
10 Sep - 15 Sep	Avianca	direct
06 Sep - 14 Sep	Avianca	direct
30 Sep - 01 Oct	Avianca	direct
10 Sep - 16 Sep	Avianca	direct

Also check the deals for one-way flights from San Salvador to Washington 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 San Salvador to Washington in September from $251

Return flights