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

Return flights

10 Dec - 17 Dec	Finnair
30 Dec - 06 Jan	Finnair
05 Dec - 12 Dec	Finnair
11 Dec - 18 Dec	Finnair
21 Dec - 27 Dec	Icelandair
18 Dec - 05 Jan	Alaska Airlines
20 Dec - 05 Jan	Alaska Airlines
23 Dec - 30 Dec	Finnair
16 Dec - 23 Dec	Finnair
28 Dec - 04 Jan	Finnair
26 Dec - 02 Jan	Finnair
22 Dec - 29 Dec	Finnair
27 Dec - 03 Jan	Finnair
21 Dec - 28 Dec	Finnair
24 Dec - 31 Dec	Finnair
29 Dec - 05 Jan	Finnair
31 Dec - 07 Jan	Finnair
17 Dec - 24 Dec	Finnair

Also check the deals for one-way flights from Seattle to Stockholm in December.

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 December from $510

Return flights