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

Return flights

10 Dec - 22 Dec	Turkish Airlines
01 Dec - 11 Dec	Turkish Airlines
08 Dec - 22 Dec	Turkish Airlines
10 Dec - 16 Jan	Turkish Airlines
15 Dec - 15 Jan	Turkish Airlines
25 Dec - 15 Jan	Turkish Airlines
27 Dec - 16 Jan	Turkish Airlines
20 Dec - 10 Jan	Turkish Airlines
20 Dec - 08 Jan	Turkish Airlines
17 Dec - 02 Jan	Turkish Airlines
09 Dec - 31 Dec	Finnair
18 Dec - 05 Jan	Turkish Airlines
19 Dec - 05 Jan	Turkish Airlines
20 Dec - 03 Jan	Turkish Airlines

Also check the deals for one-way flights from Helsinki to Sydney 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 Helsinki to Sydney in December from $1278

Return flights