Cheapest return flights from Washington to Copenhagen in December from 435€

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

Return flights

09 Dec - 14 Dec SWISS
07 Dec - 14 Dec Lufthansa
10 Dec - 13 Dec SWISS
11 Dec - 15 Dec SWISS
11 Dec - 14 Dec SWISS
12 Dec - 15 Dec SWISS
16 Dec - 22 Dec SWISS
31 Dec - 05 Jan Lufthansa
23 Dec - 30 Dec United
24 Dec - 31 Dec SWISS
18 Dec - 24 Dec SWISS
29 Dec - 05 Jan Lufthansa
25 Dec - 01 Jan Lufthansa
27 Dec - 03 Jan Frontier Airlines
23 Dec - 02 Jan Frontier Airlines
26 Dec - 02 Jan Lufthansa

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

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