AirHint found the following cheapest return flights from Newark (EWR) to Sao Paulo (GRU) in September 2025 (see full year).

Return flights

13 Sep - 27 Sep	Spirit Airlines
18 Sep - 30 Sep	Air Canada
07 Sep - 20 Sep	Spirit Airlines
01 Sep - 04 Sep	Spirit Airlines
04 Sep - 09 Sep	Spirit Airlines
06 Sep - 11 Sep	Spirit Airlines
11 Sep - 13 Sep	Spirit Airlines
26 Sep - 27 Sep	Spirit Airlines
11 Sep - 17 Sep	Spirit Airlines
04 Sep - 11 Sep	Spirit Airlines
22 Sep - 06 Oct	Spirit Airlines
29 Sep - 06 Oct	Spirit Airlines
18 Sep - 16 Oct	United	direct
30 Sep - 07 Oct	Spirit Airlines
30 Sep - 04 Oct	Spirit Airlines

Also check the deals for one-way flights from Newark 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 return flights from Newark to Sao Paulo in September from 489€

Return flights