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

Return flights

23 Sep - 22 Oct	VietJet Air
29 Sep - 14 Oct	VietJet Air
24 Sep - 15 Oct	VietJet Air
23 Sep - 29 Sep	VietJet Air
28 Sep - 02 Oct	VietJet Air
20 Sep - 10 Oct	AirAsia X
24 Sep - 07 Oct	VietJet Air
23 Sep - 10 Oct	VietJet Air
28 Sep - 28 Oct	Qatar Airways
26 Sep - 10 Oct	VietJet Air
20 Sep - 27 Sep	Scoot
26 Sep - 11 Oct	VietJet Air
21 Sep - 26 Sep	Qatar Airways
19 Sep - 22 Sep	Qatar Airways
23 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 $1308

Return flights