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

Return flights

29 Dec - 13 Jan	Finnair
24 Dec - 13 Jan	Finnair
24 Dec - 14 Jan	Finnair
08 Dec - 22 Dec	Finnair
11 Dec - 25 Dec	Icelandair
25 Dec - 08 Jan	Icelandair
15 Dec - 30 Dec	Icelandair
11 Dec - 20 Dec	Icelandair
22 Dec - 08 Jan	Icelandair
12 Dec - 28 Dec	Icelandair
20 Dec - 16 Jan	Icelandair
22 Dec - 05 Jan	Icelandair
24 Dec - 04 Jan	Delta
26 Dec - 02 Jan	Finnair

Also check the deals for one-way flights from San Jose 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 San Jose to Helsinki in December from $780

Return flights