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

Return flights

12 Oct - 19 Oct	Icelandair
13 Oct - 20 Oct	Icelandair
15 Oct - 22 Oct	Scandinavian Airlines
08 Oct - 19 Oct	Icelandair
08 Oct - 15 Oct	Icelandair
30 Oct - 06 Nov	Icelandair
05 Oct - 19 Oct	Icelandair
28 Oct - 04 Nov	Icelandair
08 Oct - 14 Oct	Icelandair
09 Oct - 16 Oct	Icelandair
10 Oct - 17 Oct	Icelandair
24 Oct - 31 Oct	Icelandair
26 Oct - 02 Nov	Icelandair
31 Oct - 09 Nov	Icelandair

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

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 Copenhagen in October from 345€

Return flights