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

Return flights

16 Aug - 27 Aug	Avianca
16 Aug - 25 Aug	Avianca
14 Aug - 25 Aug	Avianca
23 Aug - 27 Aug	Avianca
04 Aug - 17 Aug	Spirit Airlines
04 Aug - 11 Aug	Spirit Airlines
17 Aug - 20 Aug	Spirit Airlines
08 Aug - 05 Sep	Spirit Airlines
04 Aug - 28 Aug	Spirit Airlines
11 Aug - 23 Aug	Spirit Airlines
08 Aug - 24 Aug	Frontier Airlines
21 Aug - 06 Sep	Spirit Airlines
09 Aug - 06 Sep	Spirit Airlines
21 Aug - 06 Sep	Delta	direct
09 Aug - 06 Sep	Delta	direct

Also check the deals for one-way flights from Boston 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 Boston to Sao Paulo in August from 437€

Return flights