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

Return flights

08 Sep - 15 Sep	Scoot Tigerair
16 Sep - 24 Oct	China Southern
01 Sep - 15 Sep	Etihad Airways
23 Sep - 27 Oct	Turkish Airlines
04 Sep - 11 Sep	China Southern
23 Sep - 13 Oct	Etihad Airways
15 Sep - 23 Sep	Scoot Tigerair
11 Sep - 22 Sep	Etihad Airways
14 Sep - 22 Sep	Turkish Airlines
07 Sep - 26 Oct	Turkish Airlines
09 Sep - 30 Sep	Etihad Airways
18 Sep - 02 Oct	Etihad Airways
18 Sep - 26 Sep	Etihad Airways
04 Sep - 23 Sep	Turkish Airlines
18 Sep - 25 Sep	Etihad Airways
19 Sep - 04 Oct	Etihad Airways
19 Sep - 03 Oct	Etihad Airways
29 Sep - 21 Oct	British Airways
28 Sep - 19 Oct	Turkish Airlines
09 Sep - 24 Oct	Turkish Airlines

Also check the deals for one-way flights from Sydney to Lisbon 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 Lisbon in September from 958€

Return flights