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

Return flights

13 Dec - 11 Jan	Arajet
13 Dec - 05 Jan	Spirit Airlines
23 Dec - 30 Dec	Sun Country Airlines
28 Dec - 11 Jan	Air Canada
18 Dec - 19 Jan	Spirit Airlines
18 Dec - 25 Dec	Spirit Airlines
26 Dec - 11 Jan	Avianca
18 Dec - 28 Jan	Spirit Airlines
20 Dec - 29 Dec	Arajet
24 Dec - 31 Dec	United	direct
24 Dec - 14 Jan	United	direct
13 Dec - 03 Jan	Spirit Airlines
23 Dec - 30 Dec	United	direct
15 Dec - 03 Jan	Spirit Airlines
22 Dec - 03 Jan	Spirit Airlines
20 Dec - 29 Dec	United	direct
27 Dec - 30 Dec	United	direct

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 $763

Return flights