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

Return flights

16 Sep - 20 Sep	VietJet Air
16 Sep - 22 Sep	VietJet Air
21 Sep - 06 Oct	Scoot
20 Sep - 05 Oct	Scoot
22 Sep - 29 Sep	Qantas
18 Sep - 25 Sep	Finnair
17 Sep - 06 Oct	Thai Airways
27 Sep - 18 Oct	Qatar Airways
18 Sep - 30 Sep	Finnair
20 Sep - 29 Sep	Qantas
20 Sep - 28 Sep	Qantas
14 Sep - 03 Oct	Finnair
23 Sep - 09 Oct	Finnair
21 Sep - 10 Oct	Finnair
20 Sep - 09 Oct	Finnair
19 Sep - 09 Oct	Qantas
19 Sep - 27 Sep	Condor
23 Sep - 29 Sep	Qatar Airways
21 Sep - 29 Sep	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 1109€

Return flights