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

Return flights

03 Oct - 08 Oct	Wizz Air UK
08 Oct - 25 Oct	Wizz Air UK
13 Oct - 18 Oct	Wizz Air UK
16 Oct - 24 Oct	Wizz Air UK
13 Oct - 18 Oct	Pegasus Airlines	direct
28 Oct - 08 Nov	Pegasus Airlines
02 Oct - 05 Oct	Pegasus Airlines
08 Oct - 25 Oct	Pegasus Airlines	direct
11 Oct - 16 Oct	Pegasus Airlines
09 Oct - 17 Oct	Pegasus Airlines
01 Oct - 05 Oct	AJet
28 Oct - 01 Nov	AJet
28 Oct - 02 Nov	Pegasus Airlines
28 Oct - 08 Nov	Pegasus Airlines	direct
28 Oct - 02 Nov	Pegasus Airlines	direct

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 156€

Return flights