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

Return flights

21 Aug - 07 Sep	Ryanair
25 Aug - 12 Sep	transavia
26 Aug - 06 Sep	TAP
21 Aug - 11 Sep	transavia
09 Aug - 22 Aug	TAP
10 Aug - 24 Aug	easyJet
21 Aug - 28 Aug	Ryanair
22 Aug - 29 Aug	TAP
16 Aug - 06 Sep	Beijing Capital Airlines
15 Aug - 18 Aug	Vueling Airlines
11 Aug - 21 Aug	Ryanair
21 Aug - 30 Sep	British Airways
23 Aug - 30 Aug	TAP
15 Aug - 05 Sep	transavia
15 Aug - 28 Aug	transavia
05 Aug - 09 Aug	Aegean Airlines
01 Aug - 17 Aug	Ryanair

Also check the deals for one-way flights from Lisbon to Sydney in August.

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 August from 1141€

Return flights