Cheapest return flights from Seattle to Helsinki in December from $665

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

Return flights

29 Dec - 14 Jan Icelandair
09 Dec - 16 Dec Finnair
02 Dec - 09 Dec Finnair
04 Dec - 11 Dec Finnair
07 Dec - 14 Dec Finnair
03 Dec - 27 Dec Air France
05 Dec - 27 Dec WestJet
16 Dec - 23 Dec Finnair
10 Dec - 17 Dec Alaska Airlines
01 Dec - 08 Dec Alaska Airlines
31 Dec - 07 Jan Alaska Airlines
14 Dec - 21 Dec Finnair
30 Dec - 06 Jan Finnair
29 Dec - 05 Jan Finnair
26 Dec - 02 Jan Finnair
25 Dec - 01 Jan Finnair
28 Dec - 04 Jan Finnair
27 Dec - 03 Jan Finnair

Also check the deals for one-way flights from Seattle to Helsinki in December.

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