Cheapest return flights from Chicago to Sao Paulo in December from $841

AirHint found the following cheapest return flights from Chicago (MDW) to Sao Paulo (GRU) in December 2025 (see full year).

Return flights

29 Dec - 17 Jan Frontier Airlines
12 Dec - 10 Jan Frontier Airlines
24 Dec - 11 Jan Frontier Airlines
20 Dec - 29 Dec Frontier Airlines
12 Dec - 11 Jan Frontier Airlines
19 Dec - 05 Jan Frontier Airlines
18 Dec - 10 Jan Frontier Airlines
26 Dec - 11 Jan Frontier Airlines
24 Dec - 05 Jan Frontier Airlines
30 Dec - 09 Jan Delta
21 Dec - 03 Jan Frontier Airlines
06 Dec - 07 Dec LATAM Airlines Group

Also check the deals for one-way flights from Chicago to Sao Paulo in December.

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