Cheapest return flights from Seattle to Copenhagen in September from 406€

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

Return flights

12 Sep - 04 Oct Icelandair
11 Sep - 04 Oct Icelandair
02 Sep - 09 Sep Icelandair
04 Sep - 11 Sep Icelandair
10 Sep - 17 Sep Icelandair
12 Sep - 19 Sep Icelandair
06 Sep - 28 Sep Icelandair
06 Sep - 13 Sep Delta
26 Sep - 03 Oct Icelandair
29 Sep - 06 Oct Icelandair
16 Sep - 23 Sep Icelandair
23 Sep - 30 Sep Icelandair
13 Sep - 20 Sep Virgin Atlantic
18 Sep - 25 Sep Icelandair

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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