Cheapest return flights from Seattle to Copenhagen in September from $428

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

Return flights

01 Sep - 08 Sep Scandinavian Airlines
22 Sep - 29 Sep Scandinavian Airlines
15 Sep - 22 Sep Scandinavian Airlines
08 Sep - 15 Sep Scandinavian Airlines direct
13 Sep - 20 Sep Scandinavian Airlines
20 Sep - 27 Sep Scandinavian Airlines
06 Sep - 13 Sep Scandinavian Airlines
04 Sep - 11 Sep Scandinavian Airlines
05 Sep - 12 Sep Scandinavian Airlines
11 Sep - 18 Sep Scandinavian Airlines
25 Sep - 02 Oct Scandinavian Airlines

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

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