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

Return flights

19 Oct - 03 Nov	Scoot Tigerair
30 Oct - 30 Nov	Turkish Airlines
15 Oct - 29 Oct	Turkish Airlines
17 Oct - 14 Nov	Turkish Airlines
13 Oct - 20 Oct	Air Canada
02 Oct - 14 Oct	Turkish Airlines
14 Oct - 24 Oct	Etihad Airways
14 Oct - 26 Oct	Etihad Airways
13 Oct - 19 Oct	Etihad Airways
06 Oct - 19 Oct	Etihad Airways

Also check the deals for one-way flights from Sydney to Lisbon 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 Lisbon in October from 882€

Return flights