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

Return flights

02 Sep - 12 Sep	TAP
04 Sep - 09 Sep	Icelandair
16 Sep - 23 Sep	TAP
05 Sep - 12 Sep	TAP
07 Sep - 21 Sep	TAP
01 Sep - 08 Sep	TAP
13 Sep - 23 Sep	TAP
06 Sep - 18 Sep	TAP
01 Sep - 12 Sep	TAP
04 Sep - 13 Sep	TAP
28 Sep - 06 Oct	TAP
24 Sep - 01 Oct	TAP
15 Sep - 01 Oct	TAP
28 Sep - 02 Oct	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 $529

Return flights