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

Return flights

14 Sep - 26 Sep	Aer Lingus
09 Sep - 17 Sep	Air Canada
28 Sep - 05 Oct	Alaska Airlines
02 Sep - 18 Sep	Alaska Airlines
08 Sep - 14 Sep	Alaska Airlines
05 Sep - 24 Sep	Alaska Airlines
05 Sep - 21 Sep	Alaska Airlines
28 Sep - 07 Oct	Icelandair
03 Sep - 10 Sep	Icelandair
25 Sep - 29 Sep	Alaska Airlines
13 Sep - 27 Sep	Alaska Airlines
15 Sep - 20 Sep	Icelandair
05 Sep - 16 Oct	Alaska Airlines
21 Sep - 09 Oct	TAP
24 Sep - 09 Oct	TAP

Also check the deals for one-way flights from Seattle 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 Seattle to Paris in September from $575

Return flights