Cheapest return SEA–CPH flights, September

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
27 Sep - 04 Oct Icelandair
24 Sep - 01 Oct Icelandair
25 Sep - 02 Oct Icelandair
27 Sep - 02 Oct Icelandair
28 Sep - 05 Oct Icelandair
09 Sep - 30 Sep Icelandair
04 Sep - 18 Sep Icelandair
01 Sep - 08 Sep Icelandair
02 Sep - 09 Sep Icelandair
13 Sep - 20 Sep Icelandair
17 Sep - 24 Sep Icelandair
18 Sep - 25 Sep Icelandair
03 Sep - 10 Sep Icelandair
04 Sep - 11 Sep Icelandair
08 Sep - 15 Sep Icelandair
29 Sep - 06 Oct Scandinavian Airlines direct
27 Sep - 04 Oct Scandinavian Airlines direct
27 Sep - 02 Oct Scandinavian Airlines direct

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

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