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

Return flights

11 Sep - 03 Oct	Icelandair
08 Sep - 16 Sep	Icelandair
03 Sep - 10 Sep	Icelandair
05 Sep - 16 Oct	Icelandair
23 Sep - 07 Oct	Icelandair
16 Sep - 07 Oct	Icelandair
28 Sep - 05 Oct	Icelandair
04 Sep - 18 Sep	Icelandair
05 Sep - 15 Sep	Icelandair
02 Sep - 10 Sep	Icelandair
24 Sep - 09 Oct	Icelandair
19 Sep - 21 Sep	Icelandair
20 Sep - 20 Oct	Condor
14 Sep - 28 Sep	Condor
27 Sep - 29 Sep	Icelandair
24 Sep - 09 Oct	Delta	direct
16 Sep - 07 Oct	Virgin Atlantic	direct
23 Sep - 07 Oct	Air France	direct
04 Sep - 18 Sep	Air France	direct
14 Sep - 28 Sep	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 $492

Return flights