Cheapest return flights from Seattle to Copenhagen in December from 479€

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

Return flights

09 Dec - 16 Dec Delta
09 Dec - 11 Dec Delta
22 Dec - 26 Jan Icelandair
14 Dec - 23 Dec Frontier Airlines
12 Dec - 04 Jan Aer Lingus
19 Dec - 29 Dec KLM
22 Dec - 27 Dec Aer Lingus
26 Dec - 03 Jan Icelandair
30 Dec - 06 Jan Icelandair
27 Dec - 03 Jan Condor

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

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