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

Return flights

21 Sep - 19 Oct	Etihad Airways
28 Sep - 30 Oct	Turkish Airlines
07 Sep - 18 Sep	Air China
03 Sep - 10 Sep	VietJet Air
02 Sep - 09 Sep	VietJet Air
04 Sep - 09 Sep	Scoot
03 Sep - 17 Sep	VietJet Air
02 Sep - 11 Sep	VietJet Air
29 Sep - 18 Oct	Etihad Airways
09 Sep - 23 Sep	Scoot
02 Sep - 19 Sep	VietJet Air
15 Sep - 30 Sep	VietJet Air
20 Sep - 20 Oct	Air China
15 Sep - 22 Sep	VietJet Air
23 Sep - 07 Oct	Air Canada
29 Sep - 14 Oct	Air Canada
15 Sep - 05 Oct	VietJet Air
22 Sep - 18 Oct	Scoot
17 Sep - 02 Oct	VietJet Air
16 Sep - 05 Oct	VietJet Air

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 $883

Return flights