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

Return flights

16 Sep - 29 Oct	Ryanair
17 Sep - 15 Oct	easyJet
06 Sep - 30 Sep	TAP
13 Sep - 18 Sep	TAP
10 Sep - 16 Sep	easyJet
22 Sep - 10 Oct	TAP
09 Sep - 16 Sep	TAP
02 Sep - 09 Sep	Etihad Airways
07 Sep - 22 Sep	easyJet
18 Sep - 03 Oct	Ryanair
02 Sep - 16 Sep	Air Europa
14 Sep - 21 Sep	Air Europa
10 Sep - 24 Sep	easyJet
15 Sep - 22 Sep	Iberia
17 Sep - 08 Oct	easyJet
16 Sep - 01 Oct	British Airways
28 Sep - 14 Oct	Lufthansa
28 Sep - 12 Oct	Aegean Airlines
30 Sep - 07 Oct	easyJet
30 Sep - 14 Oct	easyJet

Also check the deals for one-way flights from Lisbon to Sydney 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 Lisbon to Sydney in September from 830€

Return flights