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

Return flights

11 Sep - 18 Sep	Air China
10 Sep - 16 Sep	Sichuan Airlines
16 Sep - 22 Sep	Scoot
08 Sep - 18 Sep	Scoot
23 Sep - 06 Oct	Sichuan Airlines
24 Sep - 01 Oct	AirAsia X
07 Sep - 21 Sep	Turkish Airlines
21 Sep - 15 Oct	Thai Airways
12 Sep - 11 Oct	Scoot
23 Sep - 28 Sep	Qantas
23 Sep - 29 Sep	Qantas
22 Sep - 29 Sep	Qantas
26 Sep - 04 Oct	Jetstar
08 Sep - 15 Sep	Qantas
08 Sep - 27 Sep	Qantas
24 Sep - 08 Oct	Etihad Airways
26 Sep - 10 Oct	Turkish Airlines
13 Sep - 04 Oct	Qatar Airways

Also check the deals for one-way flights from Sydney to Helsinki in September.

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 September from $1013

Return flights