Cheapest return flights from Washington to Copenhagen in December from $358

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

Return flights

02 Dec - 08 Dec TAP
01 Dec - 07 Dec TAP
03 Dec - 08 Dec TAP
04 Dec - 10 Dec TAP
06 Dec - 13 Dec Icelandair
01 Dec - 06 Dec Lufthansa
16 Dec - 23 Dec Icelandair
04 Dec - 06 Dec SWISS
06 Dec - 22 Dec SWISS
03 Dec - 04 Dec KLM
17 Dec - 10 Jan Icelandair
08 Dec - 05 Jan Icelandair
30 Dec - 06 Jan Icelandair
21 Dec - 10 Jan Frontier Airlines
17 Dec - 06 Jan Icelandair
09 Dec - 03 Jan TAP
27 Dec - 01 Jan Lufthansa
28 Dec - 04 Jan SWISS
26 Dec - 05 Jan TAP
12 Dec - 03 Jan Frontier Airlines

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

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