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

Return flights

09 Sep - 16 Sep	Air China
07 Sep - 18 Sep	Air China
17 Sep - 24 Sep	Scoot Tigerair
02 Sep - 09 Sep	Air China
15 Sep - 22 Sep	Scoot Tigerair
17 Sep - 23 Sep	Scoot Tigerair
04 Sep - 17 Sep	Scoot Tigerair
18 Sep - 25 Sep	Air China
09 Sep - 23 Sep	Turkish Airlines
10 Sep - 17 Sep	Turkish Airlines
30 Sep - 16 Oct	Turkish Airlines
26 Sep - 18 Oct	Etihad Airways
28 Sep - 15 Oct	Turkish Airlines
28 Sep - 14 Oct	Turkish Airlines
28 Sep - 13 Oct	Turkish Airlines
28 Sep - 12 Oct	Scoot Tigerair
11 Sep - 23 Oct	Turkish Airlines
30 Sep - 28 Oct	Virgin Australia
26 Sep - 03 Oct	Etihad Airways
28 Sep - 22 Oct	Qatar Airways

Also check the deals for one-way flights from Sydney to Barcelona 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 Barcelona in September from 786€

Return flights