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

Return flights

04 Dec - 09 Dec	Avianca
05 Dec - 07 Dec	Avianca
05 Dec - 09 Dec	Avianca
01 Dec - 11 Dec	Copa
08 Dec - 12 Dec	Avianca
04 Dec - 14 Dec	Avianca
02 Dec - 12 Dec	Avianca
03 Dec - 13 Dec	Avianca
06 Dec - 21 Dec	Frontier Airlines
05 Dec - 15 Dec	Copa
23 Dec - 13 Jan	Frontier Airlines
14 Dec - 06 Jan	Frontier Airlines
22 Dec - 01 Jan	Frontier Airlines
24 Dec - 01 Jan	Frontier Airlines
26 Dec - 03 Jan	Allegiant Air
21 Dec - 07 Jan	Frontier Airlines
17 Dec - 03 Jan	Avianca
20 Dec - 04 Jan	Frontier Airlines
07 Dec - 03 Jan	Frontier Airlines
19 Dec - 05 Jan	Frontier Airlines

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 $614

Return flights