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

Return flights

02 Dec - 12 Dec	Spirit Airlines
01 Dec - 11 Dec	LATAM Airlines Group
06 Dec - 14 Dec	Arajet
15 Dec - 12 Jan	Arajet
14 Dec - 25 Jan	Spirit Airlines
24 Dec - 14 Jan	GOL Linhas Aéreas
15 Dec - 13 Jan	Arajet
15 Dec - 11 Jan	Arajet
10 Dec - 17 Dec	Spirit Airlines
12 Dec - 12 Jan	Spirit Airlines
03 Dec - 13 Dec	GOL Linhas Aéreas
20 Dec - 18 Jan	LATAM Airlines Group
16 Dec - 12 Jan	Spirit Airlines
13 Dec - 19 Jan	Spirit Airlines
14 Dec - 13 Jan	Copa
08 Dec - 26 Dec	Arajet
07 Dec - 17 Dec	Spirit Airlines
05 Dec - 15 Dec	GOL Linhas Aéreas
14 Dec - 21 Dec	Spirit Airlines
20 Dec - 27 Dec	LATAM Airlines Group

Also check the deals for one-way flights from Chicago to Sao Paulo 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 Chicago to Sao Paulo in December from $561

Return flights