Cheapest return SEA–HEL flights, September

AirHint found the following cheapest return flights from Seattle (SEA) to Helsinki (HEL) in September 2026 (see full year).

Return flights

29 Sep - 08 Oct Icelandair
15 Sep - 24 Sep Icelandair
23 Sep - 02 Oct Icelandair
15 Sep - 29 Sep Scandinavian Airlines
01 Sep - 30 Sep Icelandair
27 Sep - 05 Oct Icelandair
13 Sep - 24 Sep Icelandair
15 Sep - 23 Sep Turkish Airlines

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

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