Cheapest one-way flights from Seattle to Copenhagen in September from 289€

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

One-Way flights

26 Sep Frontier Airlines
25 Sep Frontier Airlines
10 Sep WestJet
09 Sep Icelandair
17 Sep Alaska Airlines
13 Sep Delta
18 Sep Frontier Airlines
19 Sep Alaska Airlines
26 Sep Scandinavian Airlines direct
17 Sep Scandinavian Airlines direct

Also check the deals for return 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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