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

Return flights

22 Oct - 26 Oct	airBaltic
15 Oct - 21 Oct	airBaltic
31 Oct - 02 Nov	airBaltic
24 Oct - 26 Oct	airBaltic
08 Oct - 11 Oct	AJet
01 Oct - 11 Oct	Pegasus Airlines
04 Oct - 08 Oct	Wizz Air UK
27 Oct - 05 Nov	Wizz Air UK
27 Oct - 06 Nov	Wizz Air UK
27 Oct - 03 Nov	Wizz Air UK
27 Oct - 04 Nov	Wizz Air UK
27 Oct - 09 Nov	Wizz Air UK
29 Oct - 05 Nov	Wizz Air UK
07 Oct - 09 Oct	AJet
01 Oct - 03 Oct	AJet
02 Oct - 14 Oct	Pegasus Airlines
08 Oct - 08 Oct	AJet
27 Oct - 02 Nov	Wizz Air UK
25 Oct - 02 Nov	Pegasus Airlines
28 Oct - 08 Nov	AJet

Also check the deals for one-way flights from Istanbul 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 Istanbul to Helsinki in October from $127

Return flights