Cheapest return flights from Washington to Copenhagen in September from $461

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

Return flights

29 Sep - 25 Oct Icelandair
24 Sep - 01 Oct Air Canada
30 Sep - 06 Oct Scandinavian Airlines direct
17 Sep - 24 Sep Lufthansa
23 Sep - 28 Sep Air Canada
24 Sep - 28 Sep Air Canada
18 Sep - 25 Sep Air Canada
19 Sep - 24 Sep SWISS
22 Sep - 18 Oct Lufthansa
19 Sep - 29 Sep SWISS
18 Sep - 22 Sep Air Canada
25 Sep - 02 Oct Lufthansa
29 Sep - 06 Oct Lufthansa
25 Sep - 18 Oct Scandinavian Airlines direct
26 Sep - 18 Oct Scandinavian Airlines direct
28 Sep - 05 Oct Lufthansa
24 Sep - 01 Oct Scandinavian Airlines direct
23 Sep - 28 Sep Scandinavian Airlines direct
21 Sep - 28 Sep Lufthansa
24 Sep - 28 Sep Scandinavian Airlines direct

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

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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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