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

Return flights

15 Dec - 15 Jan	Turkish Airlines
07 Dec - 14 Dec	Turkish Airlines
15 Dec - 28 Dec	Turkish Airlines
22 Dec - 29 Dec	Turkish Airlines
15 Dec - 31 Dec	Turkish Airlines
10 Dec - 14 Jan	Turkish Airlines
17 Dec - 07 Jan	Turkish Airlines
25 Dec - 16 Jan	Turkish Airlines
25 Dec - 14 Jan	Turkish Airlines
12 Dec - 03 Jan	Turkish Airlines
26 Dec - 15 Jan	Turkish Airlines
10 Dec - 10 Jan	Turkish Airlines
11 Dec - 10 Jan	Turkish Airlines
25 Dec - 23 Jan	Turkish Airlines
16 Dec - 26 Dec	Turkish Airlines
12 Dec - 27 Dec	Turkish Airlines
08 Dec - 18 Dec	Etihad Airways
12 Dec - 17 Dec	Turkish Airlines
19 Dec - 29 Dec	Finnair
19 Dec - 30 Dec	Finnair

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 $1386

Return flights