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

Return flights

22 Dec - 18 Jan	Spirit Airlines
29 Dec - 12 Jan	United
20 Dec - 16 Jan	Avianca
17 Dec - 27 Dec	LATAM Airlines Group
16 Dec - 15 Jan	Delta
12 Dec - 19 Dec	Copa
18 Dec - 27 Dec	Air Canada
20 Dec - 09 Jan	Avianca
18 Dec - 15 Jan	Air Canada
12 Dec - 11 Jan	Air Canada
19 Dec - 28 Dec	Air Canada
12 Dec - 11 Jan	Delta	direct
11 Dec - 01 Jan	Delta	direct
12 Dec - 01 Jan	Air Canada
19 Dec - 28 Dec	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.

Book a cheap hotel in Sao Paulo

Cheap car rent in Sao Paulo

Cheapest return flights from Boston to Sao Paulo in December from 928€

Return flights