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

Return flights

22 Dec - 01 Jan	Copa
22 Dec - 31 Dec	Copa
22 Dec - 14 Jan	Sun Country Airlines
25 Dec - 12 Jan	GOL Linhas Aéreas
22 Dec - 02 Jan	Allegiant Air
25 Dec - 28 Dec	Sun Country Airlines
23 Dec - 27 Dec	Sun Country Airlines
25 Dec - 28 Dec	LATAM Airlines Group	direct
24 Dec - 27 Dec	Sun Country Airlines
22 Dec - 07 Jan	Allegiant Air
22 Dec - 03 Jan	Allegiant Air
22 Dec - 04 Jan	LATAM Airlines Group
22 Dec - 14 Jan	LATAM Airlines Group	direct
22 Dec - 31 Dec	Delta	direct
22 Dec - 01 Jan	Delta	direct
18 Dec - 08 Jan	Air Canada

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 $564

Return flights