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

Return flights

04 Dec - 08 Dec	Frontier Airlines
05 Dec - 07 Dec	Spirit Airlines
07 Dec - 13 Dec	Spirit Airlines
15 Dec - 11 Jan	Spirit Airlines
13 Dec - 17 Jan	Frontier Airlines
20 Dec - 31 Dec	Spirit Airlines
13 Dec - 08 Jan	Frontier Airlines
18 Dec - 06 Jan	Frontier Airlines
29 Dec - 05 Jan	Sun Country Airlines
17 Dec - 04 Jan	Spirit Airlines
15 Dec - 10 Jan	LATAM Airlines Group
26 Dec - 05 Jan	Spirit Airlines
15 Dec - 08 Jan	Spirit Airlines
20 Dec - 03 Jan	Spirit Airlines
04 Dec - 08 Dec	LATAM Airlines Group	direct
20 Dec - 31 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 $595

Return flights