Cheapest return flights from Seattle to Copenhagen in December from $419

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
29 Dec - 29 Jan Icelandair
08 Dec - 15 Dec Icelandair
13 Dec - 20 Dec Icelandair
23 Dec - 30 Dec Icelandair
20 Dec - 27 Dec Icelandair

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

Skyscanner

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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Feel free to contact us with any feedback or request another flight research.