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

Return flights

11 Sep - 19 Oct	Wizz Air Malta
11 Sep - 12 Oct	Wizz Air Malta
17 Sep - 06 Oct	Wizz Air Malta
10 Sep - 07 Oct	Wizz Air Malta
20 Sep - 05 Oct	Wizz Air Malta
18 Sep - 17 Oct	Wizz Air Malta
18 Sep - 18 Oct	Wizz Air Malta
14 Sep - 17 Sep	Ryanair
24 Sep - 15 Oct	Ryanair
03 Sep - 17 Sep	Wizz Air Malta
11 Sep - 18 Sep	Iberojet
15 Sep - 14 Oct	Sichuan Airlines
02 Sep - 23 Sep	Air China
16 Sep - 23 Sep	Air China
06 Sep - 12 Sep	Wizz Air Malta
03 Sep - 18 Sep	Wizz Air Malta
04 Sep - 12 Sep	Wizz Air Malta
01 Sep - 08 Sep	Sichuan Airlines
10 Sep - 21 Sep	Wizz Air Malta
15 Sep - 07 Oct	Sichuan Airlines

Also check the deals for one-way flights from Madrid to Sydney 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 Madrid to Sydney in September from $948

Return flights