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

Return flights

24 Sep - 12 Oct	Condor
30 Sep - 13 Oct	Condor
02 Sep - 10 Sep	Condor
10 Sep - 17 Sep	Hawaiian Airlines
08 Sep - 15 Sep	Condor
05 Sep - 15 Sep	Condor
09 Sep - 16 Sep	Aer Lingus
07 Sep - 16 Sep	Aer Lingus
24 Sep - 09 Oct	Aer Lingus
23 Sep - 27 Sep	Condor
20 Sep - 28 Sep	Frontier Airlines
13 Sep - 26 Sep	Condor
15 Sep - 20 Sep	Hawaiian Airlines
14 Sep - 11 Oct	Scandinavian Airlines
16 Sep - 04 Oct	Condor
13 Sep - 04 Oct	Condor
17 Sep - 04 Oct	Alaska Airlines
18 Sep - 04 Oct	Turkish Airlines
24 Sep - 09 Oct	Delta	direct
24 Sep - 12 Oct	Air France	direct

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 494€

Return flights