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

One-Way flights

29 Sep	Hawaiian Airlines
13 Sep	Frontier Airlines
16 Sep	Frontier Airlines
18 Sep	Frontier Airlines
24 Sep	Alaska Airlines
15 Sep	WestJet
19 Sep	Alaska Airlines
10 Sep	WestJet
12 Sep	Alaska Airlines
08 Sep	Frontier Airlines

Also check the deals for return 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 one-way flights from Seattle to Paris in September from 258€

One-Way flights