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

Return flights

30 Sep - 30 Oct	Turkish Airlines
30 Sep - 31 Oct	Turkish Airlines
29 Sep - 14 Oct	China Eastern
28 Sep - 21 Oct	VietJet Air
29 Sep - 31 Oct	China Eastern
29 Sep - 21 Oct	Qatar Airways
23 Sep - 22 Oct	VietJet Air
15 Sep - 22 Sep	Scoot
24 Sep - 15 Oct	VietJet Air
27 Sep - 21 Oct	Jetstar
26 Sep - 21 Oct	VietJet Air
18 Sep - 25 Sep	Scoot
14 Sep - 18 Sep	Jetstar
16 Sep - 21 Sep	Qatar Airways
17 Sep - 29 Sep	Qatar Airways
20 Sep - 28 Sep	Qatar Airways
16 Sep - 24 Sep	Emirates
15 Sep - 23 Sep	Emirates
18 Sep - 30 Sep	Emirates

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 1009€

Return flights