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

Return flights

03 Dec - 15 Jan	Avianca
04 Dec - 14 Dec	Avianca
08 Dec - 08 Jan	Copa
12 Dec - 31 Dec	Avianca
03 Dec - 15 Jan	United	direct
17 Dec - 13 Jan	Volaris El Salvador
16 Dec - 13 Jan	Avianca
25 Dec - 12 Jan	LATAM Airlines Group
27 Dec - 12 Jan	Air Canada
26 Dec - 12 Jan	Copa
18 Dec - 25 Dec	Volaris El Salvador
14 Dec - 02 Jan	LATAM Airlines Group
14 Dec - 03 Jan	LATAM Airlines Group
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 $637

Return flights