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

Return flights

01 Dec - 05 Dec	Scandinavian Airlines
03 Dec - 07 Dec	Scandinavian Airlines
06 Dec - 13 Dec	Scandinavian Airlines
01 Dec - 08 Dec	Scandinavian Airlines
29 Dec - 05 Jan	Scandinavian Airlines
11 Dec - 18 Dec	Scandinavian Airlines
16 Dec - 23 Dec	United
26 Dec - 05 Jan	Lufthansa
21 Dec - 28 Dec	Scandinavian Airlines
26 Dec - 02 Jan	Scandinavian Airlines

Also check the deals for one-way flights from Chicago 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 Chicago to Helsinki in December from $420

Return flights