Cheapest return flights from Seattle to Copenhagen in September from $511

Best time to book flights for Seattle (SEA) to Copenhagen (CPH) flights at AirHint

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

Return flights

04 Sep - 10 Sep Icelandair
02 Sep - 09 Sep Icelandair
12 Sep - 19 Sep Icelandair
27 Sep - 04 Oct Icelandair
22 Sep - 29 Sep Icelandair
17 Sep - 24 Sep Icelandair
05 Sep - 14 Sep Air Canada
05 Sep - 14 Sep Scandinavian Airlines direct

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

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.

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