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

Return flights

15 Dec - 30 Jan	Spirit Airlines
04 Dec - 11 Dec	Delta
01 Dec - 08 Dec	American Airlines
03 Dec - 16 Dec	United
01 Dec - 11 Dec	jetBlue
03 Dec - 13 Dec	jetBlue
14 Dec - 17 Jan	Frontier Airlines
15 Dec - 21 Dec	Spirit Airlines
15 Dec - 15 Jan	Spirit Airlines
30 Dec - 12 Jan	Spirit Airlines
04 Dec - 11 Dec	LATAM Airlines Group	direct
15 Dec - 12 Jan	Spirit Airlines
22 Dec - 14 Jan	jetBlue
29 Dec - 12 Jan	Spirit Airlines
10 Dec - 18 Dec	United
11 Dec - 01 Jan	Spirit Airlines
11 Dec - 07 Jan	Spirit Airlines
15 Dec - 29 Dec	Spirit Airlines
07 Dec - 17 Dec	jetBlue
20 Dec - 12 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.

Book a cheap hotel in Sao Paulo

Cheap car rent in Sao Paulo

Cheapest return flights from Boston to Sao Paulo in December from $516

Return flights