Cheapest return flights from Seattle to Copenhagen in September from $450

AirHint found the following cheapest return flights from Seattle (SEA) to Copenhagen (CPH) in September 2026 (see full year).

Return flights

30 Sep - 07 Oct Icelandair
29 Sep - 06 Oct Icelandair
25 Sep - 02 Oct Icelandair
26 Sep - 03 Oct Icelandair
27 Sep - 04 Oct Icelandair
24 Sep - 30 Sep Icelandair
16 Sep - 23 Sep Icelandair
17 Sep - 24 Sep Icelandair
22 Sep - 29 Sep Icelandair
23 Sep - 30 Sep Icelandair
18 Sep - 25 Sep Icelandair
20 Sep - 27 Sep Icelandair
24 Sep - 01 Oct Icelandair
19 Sep - 26 Sep Icelandair
21 Sep - 28 Sep Icelandair
28 Sep - 05 Oct Icelandair
15 Sep - 22 Sep Icelandair
29 Sep - 06 Oct Scandinavian Airlines direct
27 Sep - 04 Oct Scandinavian Airlines direct
25 Sep - 02 Oct Scandinavian Airlines direct

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

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