Cheapest return flights from Seattle to Copenhagen in December from 402€

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

Return flights

10 Dec - 17 Dec Icelandair
24 Dec - 17 Jan Icelandair
06 Dec - 13 Dec Scandinavian Airlines
02 Dec - 09 Dec Icelandair
04 Dec - 11 Dec Icelandair
25 Dec - 17 Jan Icelandair
23 Dec - 17 Jan Icelandair
15 Dec - 22 Dec Icelandair
08 Dec - 15 Dec Icelandair
30 Dec - 06 Jan Icelandair
18 Dec - 25 Dec Icelandair
12 Dec - 04 Jan Alaska Airlines
10 Dec - 03 Jan Hawaiian Airlines
12 Dec - 19 Dec Alaska Airlines
24 Dec - 31 Dec Icelandair
21 Dec - 28 Dec Icelandair
27 Dec - 03 Jan Icelandair

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

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