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

Return flights

28 Sep - 30 Sep	Avianca
22 Sep - 29 Sep	Avianca
21 Sep - 29 Sep	Avianca
25 Sep - 29 Sep	Avianca
23 Sep - 30 Sep	Avianca
24 Sep - 30 Sep	Avianca
30 Sep - 06 Oct	Avianca
21 Sep - 26 Sep	Avianca
25 Sep - 28 Sep	Avianca
30 Sep - 12 Oct	Avianca
28 Sep - 02 Oct	Copa
26 Sep - 30 Sep	Copa
28 Sep - 04 Oct	Avianca
30 Sep - 07 Oct	Avianca
26 Sep - 29 Sep	Copa
29 Sep - 05 Oct	Avianca
30 Sep - 05 Oct	Avianca
27 Sep - 03 Oct	Copa

Also check the deals for one-way flights from San Salvador to Rio Negro 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 Rio Negro in September from $261

Return flights