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

Return flights

15 Sep - 02 Oct	Air France
23 Sep - 05 Oct	KLM
08 Sep - 04 Oct	Air France
10 Sep - 16 Sep	Air Canada
25 Sep - 03 Oct	Air France
10 Sep - 23 Sep	Lufthansa
11 Sep - 16 Sep	Lufthansa
05 Sep - 27 Sep	Lufthansa
29 Sep - 06 Oct	Finnair
25 Sep - 02 Oct	Finnair
08 Sep - 15 Sep	Finnair
24 Sep - 01 Oct	Finnair
23 Sep - 30 Sep	Finnair
14 Sep - 21 Sep	Finnair
12 Sep - 19 Sep	Finnair
13 Sep - 20 Sep	Finnair
22 Sep - 29 Sep	Finnair
28 Sep - 05 Oct	Finnair
30 Sep - 07 Oct	Finnair
27 Sep - 04 Oct	Finnair

Also check the deals for one-way flights from Seattle to Stockholm 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 Stockholm in September from $432

Return flights