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

Return flights

28 Oct - 04 Nov	Icelandair
14 Oct - 21 Oct	Icelandair
20 Oct - 27 Oct	Icelandair
29 Oct - 05 Nov	Icelandair
08 Oct - 15 Oct	Icelandair
22 Oct - 29 Oct	Icelandair
16 Oct - 23 Oct	Scandinavian Airlines
01 Oct - 08 Oct	Icelandair
25 Oct - 01 Nov	Scandinavian Airlines
07 Oct - 14 Oct	Scandinavian Airlines
09 Oct - 12 Oct	British Airways
13 Oct - 20 Oct	Scandinavian Airlines
06 Oct - 13 Oct	Scandinavian Airlines
31 Oct - 07 Nov	Icelandair
26 Oct - 02 Nov	Icelandair

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

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 October from 333€

Return flights