AirHint found the following cheapest return flights from Washington (IAD) to Sao Paulo (GRU) in March 2026 (see full year).

Return flights

07 Mar - 13 Mar	Frontier Airlines
06 Mar - 16 Mar	Air Canada
13 Mar - 16 Mar	Air Canada
12 Mar - 18 Mar	Air Canada
05 Mar - 12 Mar	Frontier Airlines
20 Mar - 25 Mar	Frontier Airlines
13 Mar - 22 Mar	Frontier Airlines
06 Mar - 08 Mar	LATAM Airlines Group
14 Mar - 21 Mar	Frontier Airlines
20 Mar - 23 Mar	Avianca
12 Mar - 11 Apr	Frontier Airlines
27 Mar - 12 Apr	GOL Linhas Aéreas
27 Mar - 13 Apr	GOL Linhas Aéreas
27 Mar - 11 Apr	GOL Linhas Aéreas
28 Mar - 11 Apr	Avianca
28 Mar - 12 Apr	Avianca
20 Mar - 14 Apr	Avianca

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

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 March from $591

Return flights