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

Return flights

23 Oct - 16 Nov	Air China
19 Oct - 02 Nov	Air China
16 Oct - 26 Oct	Air China
24 Oct - 05 Nov	Turkish Airlines
05 Oct - 30 Oct	Air China
15 Oct - 26 Oct	Turkish Airlines
12 Oct - 23 Oct	Turkish Airlines
09 Oct - 29 Oct	Turkish Airlines
24 Oct - 07 Nov	Turkish Airlines
16 Oct - 03 Nov	Turkish Airlines
04 Oct - 16 Oct	Air China
07 Oct - 28 Oct	Turkish Airlines
10 Oct - 24 Oct	Turkish Airlines
07 Oct - 14 Oct	Turkish Airlines
01 Oct - 25 Oct	Etihad Airways

Also check the deals for one-way flights from Sydney to Barcelona in October.

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 October from 696€

Return flights