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

Return flights

17 Dec - 23 Jan	jetBlue
12 Dec - 18 Jan	Frontier Airlines
18 Dec - 23 Jan	Frontier Airlines
15 Dec - 08 Jan	Spirit Airlines
14 Dec - 17 Jan	jetBlue
15 Dec - 31 Dec	Spirit Airlines
18 Dec - 24 Jan	Frontier Airlines
18 Dec - 22 Jan	Frontier Airlines
20 Dec - 25 Jan	jetBlue
20 Dec - 19 Jan	jetBlue
19 Dec - 23 Jan	jetBlue
11 Dec - 25 Dec	LATAM Airlines Group
12 Dec - 19 Dec	jetBlue
12 Dec - 21 Dec	Frontier Airlines
23 Dec - 30 Dec	GOL Linhas Aéreas
13 Dec - 27 Dec	Spirit Airlines
18 Dec - 25 Dec	Spirit Airlines
19 Dec - 31 Dec	jetBlue
20 Dec - 27 Dec	LATAM Airlines Group
19 Dec - 31 Dec	Delta	direct

Also check the deals for one-way flights from Boston to Sao Paulo in December.

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 December from 622€

Return flights