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

Return flights

19 Aug - 25 Aug	Icelandair
28 Aug - 04 Sep	Icelandair
20 Aug - 27 Aug	Icelandair
26 Aug - 02 Sep	Icelandair
11 Aug - 26 Aug	Icelandair
18 Aug - 25 Aug	Icelandair
30 Aug - 06 Sep	Icelandair
12 Aug - 19 Aug	Icelandair
24 Aug - 31 Aug	Scandinavian Airlines
06 Aug - 13 Aug	Scandinavian Airlines
22 Aug - 29 Aug	Scandinavian Airlines
10 Aug - 17 Aug	Scandinavian Airlines
16 Aug - 23 Aug	Scandinavian Airlines

Also check the deals for one-way flights from Boston to Helsinki in August.

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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Cheapest return flights from Boston to Helsinki in August from $386

Return flights