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

Return flights

21 Aug - 28 Aug	Icelandair
27 Aug - 03 Sep	Icelandair
11 Aug - 26 Aug	Icelandair
19 Aug - 25 Aug	Icelandair
17 Aug - 24 Aug	Icelandair
29 Aug - 05 Sep	Icelandair
19 Aug - 26 Aug	Icelandair
23 Aug - 30 Aug	Icelandair
06 Aug - 24 Aug	Icelandair
13 Aug - 20 Aug	Icelandair
25 Aug - 01 Sep	Icelandair
05 Aug - 13 Aug	Air France
09 Aug - 16 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 345€

Return flights