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
22 Sep - 10 Oct	Hawaiian Airlines
08 Sep - 23 Sep	Condor
28 Sep - 18 Oct	Scandinavian Airlines
26 Sep - 18 Oct	Scandinavian Airlines
20 Sep - 11 Oct	Frontier Airlines
14 Sep - 19 Sep	Condor
11 Sep - 25 Sep	Condor
26 Sep - 30 Sep	Lufthansa
30 Sep - 13 Oct	Aer Lingus
27 Sep - 01 Oct	Frontier Airlines
23 Sep - 04 Oct	Hawaiian Airlines
27 Sep - 18 Oct	Frontier Airlines
18 Sep - 25 Sep	Aer Lingus
24 Sep - 09 Oct	Aer Lingus
11 Sep - 18 Sep	Condor
10 Sep - 18 Sep	Condor
12 Sep - 19 Sep	Condor
11 Sep - 14 Sep	Condor
17 Sep - 22 Sep	Icelandair

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 504€

Return flights