AirHint found the following cheapest return flights from New York (JFK) to Helsinki (HEL) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct	Delta
08 Sep - 24 Sep	Icelandair
04 Sep - 15 Sep	Delta
19 Sep - 22 Sep	Delta
15 Sep - 30 Sep	Delta
15 Sep - 15 Oct	Delta
15 Sep - 15 Oct	British Airways	direct
15 Sep - 30 Sep	British Airways	direct
30 Sep - 07 Oct	British Airways	direct
04 Sep - 14 Sep	Air France
22 Sep - 29 Sep	Scandinavian Airlines
18 Sep - 25 Sep	Scandinavian Airlines
06 Sep - 13 Sep	Scandinavian Airlines
26 Sep - 03 Oct	Scandinavian Airlines
20 Sep - 27 Sep	Scandinavian Airlines
30 Sep - 11 Oct	Delta

Also check the deals for one-way flights from New York to Helsinki in September.

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 New York to Helsinki in September from 340€

Return flights