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

Return flights

30 Sep - 08 Oct	Aer Lingus
30 Sep - 07 Oct	Condor
30 Sep - 13 Oct	Aer Lingus
10 Sep - 18 Sep	Condor
24 Sep - 01 Oct	Icelandair
22 Sep - 10 Oct	Aer Lingus
11 Sep - 03 Oct	Aer Lingus
14 Sep - 19 Sep	Condor
28 Sep - 18 Oct	Scandinavian Airlines
11 Sep - 18 Sep	Condor
11 Sep - 17 Sep	Aer Lingus
05 Sep - 16 Oct	Condor
12 Sep - 25 Sep	Scandinavian Airlines
12 Sep - 26 Sep	Scandinavian Airlines
12 Sep - 03 Oct	Scandinavian Airlines
11 Sep - 23 Sep	Turkish Airlines
17 Sep - 30 Sep	Aer Lingus
16 Sep - 11 Oct	Aer Lingus
06 Sep - 15 Sep	Condor
08 Sep - 15 Sep	Condor

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 $592

Return flights