AirHint found the following cheapest return flights from Los Angeles (LAX) to Rio Negro (MDE) in September 2025 (see full year).

Return flights

29 Sep - 17 Oct	Spirit Airlines
29 Sep - 09 Oct	Spirit Airlines
29 Sep - 20 Oct	Spirit Airlines
18 Sep - 25 Sep	Copa
19 Sep - 22 Sep	Copa
18 Sep - 30 Sep	Copa
23 Sep - 30 Sep	Copa
19 Sep - 26 Sep	Copa
20 Sep - 27 Sep	Copa
16 Sep - 23 Sep	Copa
25 Sep - 26 Oct	Copa
22 Sep - 24 Oct	Copa
27 Sep - 11 Oct	Copa
27 Sep - 01 Oct	Copa
30 Sep - 07 Oct	Spirit Airlines
29 Sep - 10 Oct	Spirit Airlines
29 Sep - 07 Oct	Spirit Airlines
22 Sep - 29 Sep	Spirit Airlines
26 Sep - 29 Sep	Spirit Airlines
15 Sep - 29 Sep	Spirit Airlines

Also check the deals for one-way flights from Los Angeles 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 Los Angeles to Rio Negro in September from $317

Return flights