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

Return flights

29 Sep - 07 Oct	Air Canada
29 Sep - 08 Oct	Air Canada
28 Sep - 06 Oct	Air Canada
21 Sep - 29 Sep	Air Canada
17 Sep - 24 Sep	Air Canada
28 Sep - 08 Oct	TAP
28 Sep - 18 Oct	Air Canada
21 Sep - 11 Oct	Royal Air Maroc
17 Sep - 11 Oct	Royal Air Maroc
20 Sep - 24 Sep	Frontier Airlines
25 Sep - 18 Oct	Frontier Airlines
27 Sep - 18 Oct	Frontier Airlines
22 Sep - 18 Oct	TAP
26 Sep - 28 Sep	Brussels Airlines
21 Sep - 28 Sep	SWISS
20 Sep - 27 Sep	Frontier Airlines
21 Sep - 27 Sep	SWISS
23 Sep - 30 Sep	TAP
20 Sep - 30 Sep	Icelandair
19 Sep - 27 Sep	Royal Air Maroc

Also check the deals for one-way flights from Washington to Paris 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.

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Cheapest return flights from Washington to Paris in September from $551

Return flights