AirHint found the following cheapest one-way flights from Atlanta (ATL) to Sao Paulo (GRU) in September 2025 (see full year).

One-Way flights

29 Sep	Spirit Airlines
25 Sep	Spirit Airlines
24 Sep	Spirit Airlines
21 Sep	Spirit Airlines
27 Sep	Spirit Airlines
11 Sep	Spirit Airlines
13 Sep	Spirit Airlines
19 Sep	Frontier Airlines
14 Sep	Spirit Airlines
29 Sep	Delta	direct

Also check the deals for return flights from Atlanta to Sao Paulo in September.

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 one-way flights from Atlanta to Sao Paulo in September from 209€

One-Way flights