AirHint found the following cheapest return flights from Boston (BOS) to Helsinki (HEL) in May 2026 (see full year).

Return flights

07 May - 14 May	Finnair
05 May - 12 May	Finnair
12 May - 19 May	Finnair
13 May - 20 May	Finnair
12 May - 26 May	Finnair
05 May - 19 May	Finnair
05 May - 22 May	Finnair
11 May - 18 May	Finnair
05 May - 18 May	Finnair
07 May - 21 May	Finnair
13 May - 04 Jun	Finnair
20 May - 03 Jun	Icelandair
19 May - 02 Jun	Icelandair
24 May - 03 Jun	Icelandair
26 May - 09 Jun	Icelandair
29 May - 12 Jun	Icelandair
26 May - 16 Jun	Icelandair
27 May - 10 Jun	Icelandair
27 May - 17 Jun	Icelandair
12 May - 01 Jun	Icelandair

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

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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from Boston to Helsinki in May from 281€

Return flights