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

Return flights

02 Dec - 05 Dec	AJet
04 Dec - 07 Dec	AJet
20 Dec - 03 Jan	Pegasus Airlines
15 Dec - 18 Dec	Pegasus Airlines
08 Dec - 15 Dec	airBaltic
24 Dec - 02 Jan	airBaltic
02 Dec - 05 Dec	Pegasus Airlines	direct
26 Dec - 03 Jan	airBaltic
24 Dec - 01 Jan	Pegasus Airlines	direct
15 Dec - 18 Dec	Pegasus Airlines	direct
08 Dec - 15 Dec	Pegasus Airlines	direct
20 Dec - 28 Dec	Pegasus Airlines	direct
20 Dec - 03 Jan	Turkish Airlines	direct
24 Dec - 02 Jan	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Helsinki in December.

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 December from 163€

Return flights