Cheapest return flights from Boston to Helsinki in September from $408

Best time to book flights for Boston (BOS) to Helsinki (HEL) flights at AirHint

AirHint found the following cheapest return flights from Boston (BOS) to Helsinki (HEL) in September 2025 (see full year).

Return flights

11 Sep - 18 Sep Icelandair
16 Sep - 23 Sep Icelandair
01 Sep - 08 Sep Scandinavian Airlines
21 Sep - 28 Sep Scandinavian Airlines
26 Sep - 03 Oct Scandinavian Airlines
06 Sep - 13 Sep Scandinavian Airlines

Also check the deals for one-way flights from Boston 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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