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

Return flights

26 Dec - 30 Dec	SWISS
27 Dec - 31 Dec	Lufthansa
31 Dec - 08 Jan	British Airways
31 Dec - 06 Jan	SWISS
29 Dec - 06 Jan	Air France
31 Dec - 01 Jan	Air France
30 Dec - 04 Jan	TAP
31 Dec - 01 Jan	Scandinavian Airlines	direct
28 Dec - 04 Jan	Lufthansa
31 Dec - 07 Jan	Scandinavian Airlines	direct
29 Dec - 05 Jan	Scandinavian Airlines	direct
27 Dec - 31 Dec	Scandinavian Airlines	direct

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 $590

Return flights