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

Return flights

31 Aug - 10 Sep	Avianca
27 Aug - 08 Sep	Avianca
28 Aug - 19 Sep	Avianca
25 Aug - 06 Sep	Avianca
21 Aug - 28 Aug	Avianca
23 Aug - 06 Sep	Avianca
21 Aug - 06 Sep	Avianca
28 Aug - 31 Aug	Avianca
30 Aug - 03 Sep	LATAM Airlines Group
23 Aug - 02 Sep	Avianca
24 Aug - 05 Sep	Avianca
25 Aug - 04 Sep	Avianca
18 Aug - 28 Aug	Copa
23 Aug - 30 Aug	Avianca
22 Aug - 29 Aug	Copa
20 Aug - 24 Aug	Avianca
18 Aug - 22 Aug	Copa
18 Aug - 21 Aug	Copa
21 Aug - 31 Aug	Copa
21 Aug - 31 Aug	LATAM Airlines Group	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 $501

Return flights