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

Return flights

03 Sep - 07 Sep	Avianca
05 Sep - 13 Sep	Avianca
08 Sep - 12 Sep	Allegiant Air
12 Sep - 14 Sep	Avianca
22 Sep - 28 Sep	Copa
09 Sep - 13 Sep	Copa
01 Sep - 15 Sep	United	direct
02 Sep - 16 Sep	United
04 Sep - 18 Sep	United
05 Sep - 19 Sep	United
18 Sep - 02 Oct	United
17 Sep - 01 Oct	United
23 Sep - 07 Oct	United
25 Sep - 09 Oct	United
28 Sep - 12 Oct	United
30 Sep - 14 Oct	United
16 Sep - 07 Oct	United	direct
21 Sep - 05 Oct	United	direct
22 Sep - 06 Oct	United	direct
26 Sep - 10 Oct	United	direct

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

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.

Book a cheap hotel in Sao Paulo

Cheap car rent in Sao Paulo

Cheapest return flights from Washington to Sao Paulo in September from $636

Return flights