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

Return flights

14 Aug - 04 Sep	Frontier Airlines
28 Aug - 04 Sep	Frontier Airlines
29 Aug - 01 Sep	Avianca
15 Aug - 05 Sep	Frontier Airlines
10 Aug - 15 Aug	Copa
19 Aug - 26 Aug	Avianca
31 Aug - 29 Sep	Avianca
21 Aug - 26 Aug	Avianca
05 Aug - 09 Aug	Avianca
05 Aug - 21 Aug	Avianca
22 Aug - 30 Aug	Avianca
15 Aug - 24 Aug	Avianca
21 Aug - 24 Aug	Copa
21 Aug - 31 Aug	Avianca
30 Aug - 01 Sep	Avianca
09 Aug - 17 Aug	Frontier Airlines
26 Aug - 09 Sep	United	direct
25 Aug - 08 Sep	United
28 Aug - 11 Sep	United
18 Aug - 01 Sep	United

Also check the deals for one-way flights from Washington to Sao Paulo in August.

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 August from $586

Return flights