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

Return flights

01 Sep - 08 Sep	Scandinavian Airlines
03 Sep - 10 Sep	Scandinavian Airlines
10 Sep - 23 Sep	Scandinavian Airlines
30 Sep - 07 Oct	Icelandair
10 Sep - 17 Sep	Scandinavian Airlines
17 Sep - 24 Sep	Scandinavian Airlines
24 Sep - 01 Oct	Scandinavian Airlines
25 Sep - 02 Oct	Icelandair
26 Sep - 03 Oct	Icelandair
27 Sep - 04 Oct	Icelandair
28 Sep - 05 Oct	Icelandair
12 Sep - 23 Sep	Icelandair
22 Sep - 29 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
16 Sep - 23 Sep	Icelandair
18 Sep - 25 Sep	Icelandair
29 Sep - 06 Oct	Delta

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 $418

Return flights