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

Return flights

25 Sep - 29 Sep	Spirit Airlines
08 Sep - 29 Sep	Spirit Airlines
05 Sep - 11 Sep	Spirit Airlines
05 Sep - 15 Sep	Spirit Airlines
08 Sep - 11 Sep	Spirit Airlines
08 Sep - 15 Sep	Spirit Airlines
04 Sep - 10 Sep	Spirit Airlines
01 Sep - 08 Sep	Spirit Airlines
19 Sep - 27 Sep	Spirit Airlines
25 Sep - 12 Oct	Spirit Airlines

Also check the deals for one-way flights from Phoenix 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 Phoenix to Rio Negro in September from $362

Return flights