AirHint found the following cheapest one-way flights from Seattle (SEA) to Helsinki (HEL) in July 2025 (see full year).

One-Way flights

21 Jul	Icelandair
14 Jul	Icelandair
14 Jul	British Airways	direct
21 Jul	British Airways	direct
23 Jul	Finnair
22 Jul	Finnair
23 Jul	Finnair	direct
27 Jul	Finnair	direct
28 Jul	Finnair	direct
13 Jul	Finnair	direct

Also check the deals for return flights from Seattle to Helsinki in July.

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 one-way flights from Seattle to Helsinki in July from 296€

One-Way flights