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

Return flights

15 Dec - 23 Dec	Turkish Airlines
15 Dec - 05 Jan	Turkish Airlines
26 Dec - 30 Jan	Turkish Airlines
26 Dec - 16 Jan	Turkish Airlines
22 Dec - 04 Jan	Turkish Airlines
27 Dec - 09 Jan	Turkish Airlines
10 Dec - 31 Dec	KLM
16 Dec - 27 Dec	Turkish Airlines
17 Dec - 28 Dec	Turkish Airlines
12 Dec - 10 Jan	Turkish Airlines
17 Dec - 27 Dec	Finnair
19 Dec - 26 Dec	Finnair
19 Dec - 09 Jan	Finnair
20 Dec - 02 Jan	Turkish Airlines
23 Dec - 10 Jan	Condor
25 Dec - 22 Jan	Qatar Airways

Also check the deals for one-way flights from Sydney 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 Sydney to Helsinki in December from 1158€

Return flights