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

Return flights

01 Dec - 07 Dec	AJet
05 Dec - 09 Dec	Wizz Air UK
03 Dec - 07 Dec	KLM
10 Dec - 14 Dec	airBaltic
29 Dec - 02 Jan	airBaltic
24 Dec - 31 Dec	airBaltic
31 Dec - 02 Jan	airBaltic
24 Dec - 28 Dec	airBaltic
22 Dec - 15 Jan	Pegasus Airlines
22 Dec - 15 Jan	Pegasus Airlines	direct
21 Dec - 31 Dec	airBaltic
06 Dec - 12 Dec	KLM
27 Dec - 03 Jan	Pegasus Airlines
11 Dec - 14 Dec	Pegasus Airlines
27 Dec - 04 Jan	Pegasus Airlines
23 Dec - 05 Jan	Pegasus Airlines
26 Dec - 03 Jan	Pegasus Airlines
30 Dec - 09 Jan	Pegasus Airlines
13 Dec - 17 Dec	KLM
23 Dec - 05 Jan	Pegasus 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 156€

Return flights