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

Return flights

13 Dec - 01 Jan	Avianca
13 Dec - 31 Dec	Avianca
12 Dec - 30 Dec	Avianca
22 Dec - 12 Jan	Allegiant Air
12 Dec - 01 Jan	Avianca
12 Dec - 31 Dec	Avianca
17 Dec - 02 Jan	Avianca
18 Dec - 02 Jan	Avianca
17 Dec - 01 Jan	Avianca
18 Dec - 01 Jan	Avianca
28 Dec - 05 Jan	Avianca
28 Dec - 04 Jan	LATAM Airlines Group
21 Dec - 14 Jan	Avianca
15 Dec - 31 Dec	Delta
16 Dec - 30 Dec	United	direct
12 Dec - 30 Dec	United	direct
12 Dec - 31 Dec	United	direct

Also check the deals for one-way flights from Washington 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 Washington to Sao Paulo in December from $763

Return flights