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

Return flights

31 Dec - 22 Jan	Copa
05 Dec - 07 Dec	Delta
09 Dec - 16 Dec	United
08 Dec - 15 Dec	United
08 Dec - 17 Dec	United
08 Dec - 18 Dec	Copa
05 Dec - 07 Dec	Delta	direct
11 Dec - 19 Dec	Copa
11 Dec - 18 Dec	United
13 Dec - 17 Jan	jetBlue
14 Dec - 17 Jan	Frontier Airlines
12 Dec - 19 Dec	Copa
26 Dec - 21 Jan	Frontier Airlines
12 Dec - 18 Jan	Spirit Airlines
18 Dec - 11 Jan	Spirit Airlines
30 Dec - 12 Jan	LATAM Airlines Group
08 Dec - 18 Dec	Delta	direct
19 Dec - 14 Jan	Spirit Airlines
19 Dec - 12 Jan	Spirit Airlines
25 Dec - 08 Jan	Frontier Airlines

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 454€

Return flights