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

Return flights

18 Aug - 05 Sep	Spirit Airlines
18 Aug - 22 Aug	Frontier Airlines
13 Aug - 20 Aug	Frontier Airlines
15 Aug - 22 Aug	Spirit Airlines
12 Aug - 24 Aug	Spirit Airlines
20 Aug - 24 Aug	Spirit Airlines
04 Aug - 11 Aug	Spirit Airlines
25 Aug - 10 Sep	Frontier Airlines
27 Aug - 04 Sep	Spirit Airlines
06 Aug - 27 Aug	Spirit Airlines
15 Aug - 30 Aug	Spirit Airlines
16 Aug - 23 Aug	Copa
02 Aug - 09 Aug	Spirit Airlines
27 Aug - 10 Sep	United
28 Aug - 11 Sep	United
29 Aug - 12 Sep	United
20 Aug - 03 Sep	United
19 Aug - 02 Sep	United
21 Aug - 04 Sep	United	direct
22 Aug - 05 Sep	United

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

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 August from 443€

Return flights