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

Return flights

08 Oct - 16 Oct	Avianca
31 Oct - 07 Nov	Avianca
06 Oct - 15 Oct	Avianca
04 Oct - 08 Oct	Avianca
23 Oct - 26 Oct	Avianca
07 Oct - 28 Oct	Avianca
08 Oct - 28 Oct	Avianca
17 Oct - 28 Oct	Avianca
30 Oct - 02 Nov	Avianca
12 Oct - 22 Oct	Avianca
20 Oct - 30 Oct	Avianca
22 Oct - 01 Nov	Avianca
24 Oct - 03 Nov	Avianca
26 Oct - 05 Nov	Avianca
10 Oct - 20 Oct	Avianca
30 Oct - 02 Nov	United	direct

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

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 October from $514

Return flights