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

Return flights

11 Sep - 24 Sep	Air China
07 Sep - 19 Sep	Air China
14 Sep - 28 Sep	Air China
14 Sep - 15 Oct	China Eastern
09 Sep - 16 Sep	Air China
09 Sep - 21 Sep	Air China
09 Sep - 21 Oct	Air China
17 Sep - 17 Oct	China Eastern
06 Sep - 13 Sep	Air China
06 Sep - 20 Sep	Air China
23 Sep - 28 Oct	Air China
07 Sep - 21 Sep	Air China
01 Sep - 15 Sep	China Eastern
09 Sep - 23 Sep	Air China
09 Sep - 15 Oct	Air China
24 Sep - 16 Oct	Etihad Airways
04 Sep - 15 Oct	Air China
27 Sep - 24 Oct	Jetstar
26 Sep - 12 Oct	Etihad Airways
16 Sep - 16 Oct	Air China

Also check the deals for one-way flights from Sydney to Madrid 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 Madrid in September from 687€

Return flights