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

Return flights

30 Dec - 14 Jan	Copa
24 Dec - 15 Jan	United
28 Dec - 13 Jan	LATAM Airlines Group
22 Dec - 14 Jan	LATAM Airlines Group
27 Dec - 12 Jan	United
15 Dec - 04 Jan	LATAM Airlines Group
15 Dec - 04 Jan	LATAM Airlines Group	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 699€

Return flights