AirHint found the following cheapest return flights from Seattle (SEA) to Helsinki (HEL) in May 2026 (see full year).
Return flights
| 04 May - 11 May | Finnair | direct | |
| 01 May - 08 May | Finnair | ||
| 02 May - 09 May | Finnair | direct | |
| 03 May - 10 May | Finnair |
Also check the deals for one-way flights from Seattle to Helsinki in May.
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