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

Return flights

02 Dec - 09 Dec	Icelandair
03 Dec - 10 Dec	Icelandair
07 Dec - 14 Dec	Scandinavian Airlines
08 Dec - 15 Dec	Scandinavian Airlines
12 Dec - 19 Dec	Icelandair
18 Dec - 08 Jan	Icelandair
18 Dec - 25 Dec	Icelandair
22 Dec - 29 Dec	Icelandair
13 Dec - 20 Dec	Icelandair
20 Dec - 31 Dec	Icelandair
28 Dec - 04 Jan	Icelandair
23 Dec - 30 Dec	Scandinavian Airlines
27 Dec - 03 Jan	Icelandair

Also check the deals for one-way flights from Boston 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 Boston to Helsinki in December from 333€

Return flights