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

Return flights

21 Aug - 05 Sep	Avianca
28 Aug - 02 Sep	Avianca
31 Aug - 02 Sep	Avianca
20 Aug - 04 Sep	jetBlue
08 Aug - 13 Aug	Spirit Airlines
11 Aug - 18 Aug	Frontier Airlines
19 Aug - 29 Aug	Spirit Airlines
13 Aug - 20 Aug	Spirit Airlines
21 Aug - 06 Sep	Spirit Airlines
18 Aug - 25 Aug	Spirit Airlines
21 Aug - 31 Aug	Spirit Airlines
15 Aug - 30 Aug	Frontier Airlines
08 Aug - 15 Aug	Spirit Airlines
10 Aug - 15 Aug	Spirit Airlines
05 Aug - 07 Aug	Frontier Airlines
21 Aug - 05 Sep	Delta	direct
21 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.

Book a cheap hotel in Sao Paulo

Cheap car rent in Sao Paulo

Cheapest return flights from Boston to Sao Paulo in August from 420€

Return flights