Cheapest return flights from Boston to Helsinki in September from $415

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

Return flights

29 Sep - 06 Oct Icelandair
03 Sep - 10 Sep Scandinavian Airlines
02 Sep - 09 Sep Icelandair
11 Sep - 18 Sep Icelandair
23 Sep - 30 Sep Icelandair
17 Sep - 24 Sep Icelandair
08 Sep - 15 Sep Scandinavian Airlines
14 Sep - 21 Sep Scandinavian Airlines
11 Sep - 14 Sep Scandinavian Airlines
20 Sep - 27 Sep Scandinavian Airlines
26 Sep - 03 Oct Scandinavian Airlines

Also check the deals for one-way flights from Boston 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.

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