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

Return flights

11 Aug - 27 Aug	Avianca
30 Aug - 07 Sep	Avianca
21 Aug - 06 Sep	Avianca
29 Aug - 06 Sep	Avianca
25 Aug - 01 Sep	Avianca
07 Aug - 22 Aug	Avianca
18 Aug - 03 Sep	Avianca
11 Aug - 21 Aug	Avianca
12 Aug - 19 Aug	Avianca
24 Aug - 31 Aug	Avianca
08 Aug - 15 Aug	Spirit Airlines
09 Aug - 27 Aug	Avianca
14 Aug - 30 Aug	Avianca
06 Aug - 23 Aug	Avianca
06 Aug - 14 Aug	Avianca
18 Aug - 03 Sep	Delta	direct
21 Aug - 06 Sep	Delta	direct
30 Aug - 07 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.

Book a cheap hotel in Sao Paulo

Cheap car rent in Sao Paulo

Cheapest return flights from Boston to Sao Paulo in August from $526

Return flights