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

Return flights

15 Dec - 13 Jan	Spirit Airlines
11 Dec - 25 Dec	Spirit Airlines
15 Dec - 18 Dec	Spirit Airlines
17 Dec - 08 Jan	Spirit Airlines
17 Dec - 06 Jan	Spirit Airlines
18 Dec - 07 Jan	Spirit Airlines
18 Dec - 08 Jan	Spirit Airlines
23 Dec - 04 Jan	Sun Country Airlines
18 Dec - 04 Jan	Spirit Airlines
25 Dec - 15 Jan	Air Canada
13 Dec - 27 Dec	LATAM Airlines Group
25 Dec - 01 Jan	Avianca
26 Dec - 11 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 $776

Return flights