Cheapest return flights from Seattle to Copenhagen in September from 423€

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

Return flights

30 Sep - 07 Oct Icelandair
09 Sep - 04 Oct Icelandair
19 Sep - 03 Oct Delta
11 Sep - 18 Sep Delta
08 Sep - 20 Sep SWISS
28 Sep - 05 Oct Icelandair
26 Sep - 11 Oct Lufthansa
10 Sep - 04 Oct Virgin Atlantic

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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