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

Return flights

23 Sep - 30 Sep	Icelandair
25 Sep - 02 Oct	Icelandair
26 Sep - 03 Oct	Icelandair
24 Sep - 01 Oct	Icelandair
30 Sep - 07 Oct	Icelandair
08 Sep - 28 Sep	TAP
19 Sep - 26 Sep	Icelandair
02 Sep - 09 Sep	Icelandair
04 Sep - 11 Sep	Icelandair
05 Sep - 12 Sep	Icelandair
09 Sep - 16 Sep	Icelandair
10 Sep - 17 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
12 Sep - 19 Sep	Icelandair
27 Sep - 04 Oct	British Airways
28 Sep - 05 Oct	British Airways
29 Sep - 06 Oct	British Airways
25 Sep - 02 Oct	Scandinavian Airlines	direct
29 Sep - 06 Oct	Scandinavian Airlines	direct
30 Sep - 07 Oct	Scandinavian Airlines	direct

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

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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Cheapest return flights from Copenhagen to Washington in September from $475

Return flights