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

Return flights

08 Sep - 22 Sep	Scoot Tigerair
01 Sep - 24 Sep	Air India
01 Sep - 17 Sep	Air India
04 Sep - 24 Sep	Air India
02 Sep - 16 Sep	Air China
01 Sep - 19 Sep	Air India
16 Sep - 23 Sep	Turkish Airlines
02 Sep - 12 Sep	Scoot Tigerair
16 Sep - 24 Sep	Turkish Airlines
16 Sep - 21 Oct	Turkish Airlines
23 Sep - 13 Oct	Turkish Airlines
11 Sep - 18 Sep	Turkish Airlines
23 Sep - 20 Oct	Turkish Airlines
23 Sep - 08 Oct	Turkish Airlines
03 Sep - 11 Oct	Scoot Tigerair
08 Sep - 04 Oct	Scoot Tigerair
03 Sep - 04 Oct	Turkish Airlines
22 Sep - 23 Oct	Emirates
15 Sep - 05 Oct	Etihad Airways
12 Sep - 05 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 $1173

Return flights