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

Return flights

09 Dec - 16 Dec	Icelandair
12 Dec - 14 Dec	Lufthansa
31 Dec - 07 Jan	Scandinavian Airlines
23 Dec - 07 Jan	Icelandair
10 Dec - 17 Dec	Lufthansa
15 Dec - 22 Dec	Lufthansa
11 Dec - 18 Dec	Lufthansa
30 Dec - 06 Jan	Lufthansa
27 Dec - 06 Jan	Aer Lingus
16 Dec - 23 Dec	Lufthansa
18 Dec - 22 Dec	Lufthansa
28 Dec - 04 Jan	TAP
14 Dec - 21 Dec	Lufthansa
23 Dec - 30 Dec	Lufthansa
27 Dec - 04 Jan	Frontier Airlines
12 Dec - 19 Dec	Lufthansa
25 Dec - 01 Jan	Scandinavian Airlines
26 Dec - 02 Jan	Lufthansa
27 Dec - 03 Jan	Lufthansa

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 $540

Return flights