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

Return flights

06 Dec - 08 Dec	Frontier Airlines
08 Dec - 15 Dec	Spirit Airlines
23 Dec - 10 Jan	Frontier Airlines
15 Dec - 10 Jan	Frontier Airlines
20 Dec - 31 Dec	Spirit Airlines
13 Dec - 08 Jan	Spirit Airlines
29 Dec - 04 Jan	Spirit Airlines
20 Dec - 27 Dec	Spirit Airlines
18 Dec - 06 Jan	Frontier Airlines
21 Dec - 27 Dec	Frontier Airlines
14 Dec - 29 Dec	Delta
17 Dec - 04 Jan	Frontier Airlines
19 Dec - 04 Jan	Frontier Airlines
11 Dec - 25 Dec	Delta
18 Dec - 04 Jan	Frontier Airlines
13 Dec - 25 Dec	Delta
15 Dec - 03 Jan	LATAM Airlines Group
19 Dec - 03 Jan	Frontier Airlines
06 Dec - 08 Dec	Delta	direct
20 Dec - 27 Dec	LATAM Airlines Group	direct

Also check the deals for one-way flights from Atlanta 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 Atlanta to Sao Paulo in December from $620

Return flights