Cheapest return flights from Seattle to Helsinki in September from 303€

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

Return flights

29 Sep - 06 Oct Scandinavian Airlines
25 Sep - 02 Oct Scandinavian Airlines
26 Sep - 03 Oct Scandinavian Airlines
22 Sep - 29 Sep Scandinavian Airlines
13 Sep - 20 Sep Scandinavian Airlines
20 Sep - 27 Sep Scandinavian Airlines
15 Sep - 22 Sep Scandinavian Airlines
12 Sep - 19 Sep Scandinavian Airlines
18 Sep - 25 Sep Scandinavian Airlines
19 Sep - 26 Sep Scandinavian Airlines
01 Sep - 08 Sep Scandinavian Airlines
08 Sep - 15 Sep Scandinavian Airlines
04 Sep - 11 Sep Scandinavian Airlines

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

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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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