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

Return flights

27 Aug - 03 Sep	Icelandair
21 Aug - 28 Aug	Icelandair
19 Aug - 26 Aug	Icelandair
24 Aug - 01 Sep	Lufthansa
29 Aug - 11 Sep	Icelandair
26 Aug - 17 Sep	Delta
25 Aug - 01 Sep	Scandinavian Airlines
31 Aug - 07 Sep	Scandinavian Airlines
22 Aug - 01 Sep	Brussels Airlines
23 Aug - 30 Aug	Icelandair
29 Aug - 05 Sep	Icelandair
17 Aug - 24 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 355€

Return flights