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

Return flights

12 May - 19 May	Icelandair
12 May - 19 May	Iberia	direct
19 May - 07 Jun	Icelandair
19 May - 02 Jun	Icelandair
12 May - 02 Jun	Icelandair
19 May - 06 Jun	Icelandair
22 May - 09 Jun	Scandinavian Airlines
12 May - 02 Jun	Iberia	direct
19 May - 02 Jun	Iberia	direct
22 May - 09 Jun	Iberia	direct
19 May - 07 Jun	Iberia	direct

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

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 Seattle to Helsinki in May from 437€

Return flights