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

Return flights

07 Sep - 16 Sep	Condor
30 Sep - 25 Oct	Condor
30 Sep - 07 Oct	Condor
15 Sep - 23 Sep	Condor
15 Sep - 25 Sep	Condor
30 Sep - 13 Oct	Condor
29 Sep - 25 Oct	Condor
07 Sep - 23 Sep	Condor
08 Sep - 20 Sep	Alaska Airlines
13 Sep - 04 Oct	Frontier Airlines
15 Sep - 24 Sep	Condor
26 Sep - 08 Oct	Condor
10 Sep - 23 Sep	Condor
20 Sep - 25 Sep	Condor
15 Sep - 22 Sep	Hawaiian Airlines
15 Sep - 11 Oct	Condor
08 Sep - 04 Oct	Condor
05 Sep - 17 Sep	Icelandair
14 Sep - 04 Oct	Icelandair
11 Sep - 04 Oct	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 512€

Return flights