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

Return flights

09 Dec - 16 Dec	Finnair
03 Dec - 10 Dec	British Airways
01 Dec - 08 Dec	British Airways
02 Dec - 09 Dec	British Airways
03 Dec - 24 Dec	Finnair
01 Dec - 13 Dec	Finnair
02 Dec - 16 Dec	Finnair
03 Dec - 11 Dec	British Airways
09 Dec - 23 Dec	Finnair
01 Dec - 19 Dec	Finnair
24 Dec - 14 Jan	Finnair
30 Dec - 20 Jan	Finnair
31 Dec - 21 Jan	Finnair
24 Dec - 13 Jan	Finnair
30 Dec - 13 Jan	Finnair
30 Dec - 14 Jan	Finnair
31 Dec - 13 Jan	Finnair
24 Dec - 01 Jan	Icelandair
25 Dec - 01 Jan	Icelandair
16 Dec - 06 Jan	Lufthansa

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 281€

Return flights