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

Return flights

01 Dec - 06 Dec	Icelandair
06 Dec - 10 Dec	Icelandair
06 Dec - 13 Dec	Icelandair
06 Dec - 15 Dec	TAP
06 Dec - 10 Dec	Scandinavian Airlines	direct
09 Dec - 16 Dec	Icelandair
03 Dec - 10 Dec	Icelandair
06 Dec - 15 Dec	Scandinavian Airlines	direct
03 Dec - 10 Dec	Scandinavian Airlines	direct
05 Dec - 27 Dec	SWISS
24 Dec - 01 Jan	United
25 Dec - 01 Jan	Icelandair
30 Dec - 06 Jan	Icelandair
24 Dec - 01 Jan	Scandinavian Airlines	direct
29 Dec - 02 Jan	Air France
09 Dec - 03 Jan	Air France
19 Dec - 04 Jan	TAP

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.

Book a cheap hotel in Copenhagen

Cheap car rent in Copenhagen

Cheapest return flights from Washington to Copenhagen in December from 357€

Return flights