Cheapest return flights from Boston to Helsinki in September from 345€

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

Return flights

10 Sep - 17 Sep Icelandair
16 Sep - 23 Sep Icelandair
01 Sep - 08 Sep Scandinavian Airlines
22 Sep - 29 Sep Scandinavian Airlines
07 Sep - 14 Sep Scandinavian Airlines
28 Sep - 05 Oct Scandinavian Airlines
25 Sep - 02 Oct Icelandair
11 Sep - 14 Sep Scandinavian Airlines
13 Sep - 20 Sep Scandinavian Airlines
19 Sep - 26 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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