Cheapest return flights from St. Louis to Rio Negro in December from $1155

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

Return flights

21 Dec - 01 Jan American Airlines
22 Dec - 01 Jan American Airlines
18 Dec - 01 Jan American Airlines
21 Dec - 03 Jan Copa
18 Dec - 02 Jan Spirit Airlines
22 Dec - 03 Jan Copa
20 Dec - 01 Jan American Airlines
22 Dec - 02 Jan American Airlines
19 Dec - 01 Jan American Airlines
20 Dec - 03 Jan Spirit Airlines

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

Skyscanner

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.

Book a cheap hotel in Rio Negro

Cheap car rent in Rio Negro

Feel free to contact us with any feedback or request another flight research.