Cheapest one-way flights from Seattle to Helsinki in September from 343€

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

One-Way flights

18 Sep jetBlue

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

Skyscanner

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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Feel free to contact us with any feedback or request another flight research.