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

Return flights

21 Dec - 24 Dec	Batik Air Malaysia
21 Dec - 18 Jan	Batik Air Malaysia
22 Dec - 24 Jan	Jetstar
22 Dec - 26 Jan	Jetstar
22 Dec - 18 Jan	Jetstar
20 Dec - 18 Jan	Batik Air Malaysia
22 Dec - 20 Jan	Jetstar
22 Dec - 16 Jan	Jetstar
22 Dec - 19 Jan	Jetstar
22 Dec - 15 Jan	Jetstar
22 Dec - 24 Dec	Scoot
24 Dec - 26 Dec	Air France
22 Dec - 23 Jan	Jetstar
24 Dec - 29 Dec	Virgin Australia
24 Dec - 25 Dec	Qantas
24 Dec - 28 Dec	Qantas
20 Dec - 24 Dec	Jetstar
24 Dec - 27 Dec	Air France
19 Dec - 24 Dec	AirAsia X
23 Dec - 24 Dec	Batik Air Malaysia

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 1530€

Return flights