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

Return flights

07 Dec - 14 Dec	Frontier Airlines
03 Dec - 05 Dec	Frontier Airlines
06 Dec - 13 Dec	Frontier Airlines
05 Dec - 09 Dec	Avianca
23 Dec - 13 Jan	Frontier Airlines
13 Dec - 23 Dec	Frontier Airlines
07 Dec - 14 Dec	United	direct
06 Dec - 21 Dec	Frontier Airlines
22 Dec - 31 Dec	Frontier Airlines
22 Dec - 01 Jan	Frontier Airlines
12 Dec - 31 Dec	Frontier Airlines
31 Dec - 16 Jan	United	direct
30 Dec - 13 Jan	United
29 Dec - 12 Jan	United	direct
30 Dec - 06 Jan	Frontier Airlines
14 Dec - 04 Jan	Frontier Airlines
31 Dec - 04 Jan	Frontier Airlines
27 Dec - 17 Jan	United	direct
23 Dec - 03 Jan	Frontier Airlines
18 Dec - 26 Dec	Avianca

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 569€

Return flights