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

Return flights

06 Dec - 10 Dec	Icelandair
03 Dec - 08 Dec	TAP
01 Dec - 08 Dec	Icelandair
02 Dec - 08 Dec	Icelandair
01 Dec - 06 Dec	Icelandair
04 Dec - 10 Dec	TAP
06 Dec - 10 Dec	Scandinavian Airlines	direct
10 Dec - 17 Dec	Scandinavian Airlines	direct
04 Dec - 10 Dec	Scandinavian Airlines	direct
04 Dec - 11 Dec	Icelandair
31 Dec - 07 Jan	Scandinavian Airlines	direct
09 Dec - 03 Jan	TAP
11 Dec - 03 Jan	Scandinavian Airlines	direct
26 Dec - 02 Jan	Icelandair

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

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 Washington to Copenhagen in December from $420

Return flights