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

Return flights

06 Dec - 13 Dec	Icelandair
08 Dec - 15 Dec	Scandinavian Airlines
10 Dec - 17 Dec	Scandinavian Airlines
01 Dec - 08 Dec	Lufthansa
28 Dec - 17 Jan	Lufthansa
11 Dec - 18 Dec	Scandinavian Airlines
27 Dec - 17 Jan	Icelandair
10 Dec - 20 Dec	Icelandair
06 Dec - 19 Dec	Icelandair
31 Dec - 07 Jan	Scandinavian Airlines
07 Dec - 19 Dec	Turkish Airlines
29 Dec - 05 Jan	Scandinavian Airlines
20 Dec - 28 Jan	Frontier Airlines
15 Dec - 22 Dec	Scandinavian Airlines
13 Dec - 20 Dec	Scandinavian Airlines
26 Dec - 04 Jan	Turkish Airlines

Also check the deals for one-way flights from Washington to Helsinki 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 Helsinki in December from $373

Return flights