Cheapest return flights from Seattle to Copenhagen in December from 403€

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

Return flights

03 Dec - 10 Dec Icelandair
02 Dec - 09 Dec Lufthansa
24 Dec - 17 Jan Icelandair
09 Dec - 11 Dec Lufthansa
05 Dec - 12 Dec Icelandair
07 Dec - 14 Dec Icelandair
17 Dec - 24 Dec Icelandair
31 Dec - 07 Jan Icelandair
11 Dec - 18 Dec Icelandair
12 Dec - 04 Jan Frontier Airlines
22 Dec - 29 Dec Frontier Airlines
08 Dec - 03 Jan WestJet
22 Dec - 27 Dec Hawaiian Airlines
15 Dec - 22 Dec Icelandair
26 Dec - 03 Jan Frontier Airlines
20 Dec - 02 Jan Sun Country Airlines
29 Dec - 05 Jan Icelandair
25 Dec - 01 Jan Icelandair

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

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