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

Return flights

13 Dec - 28 Dec	Frontier Airlines
15 Dec - 31 Dec	Frontier Airlines
23 Dec - 30 Dec	Frontier Airlines
16 Dec - 31 Dec	Frontier Airlines
25 Dec - 01 Jan	Frontier Airlines
30 Dec - 05 Jan	Frontier Airlines

Also check the deals for one-way flights from Phoenix to Rio Negro in December.

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 December from $504

Return flights