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

Return flights

31 Aug - 15 Sep	easyJet
31 Aug - 10 Sep	easyJet
21 Aug - 07 Sep	KLM
26 Aug - 06 Sep	transavia
19 Aug - 26 Aug	Finnair
31 Aug - 14 Sep	easyJet
16 Aug - 02 Sep	Finnair
21 Aug - 05 Sep	KLM
09 Aug - 15 Aug	Ryanair
09 Aug - 06 Sep	TAP
14 Aug - 21 Aug	transavia
14 Aug - 19 Aug	transavia
23 Aug - 30 Aug	TAP
15 Aug - 03 Sep	Ryanair
16 Aug - 24 Aug	Beijing Capital Airlines
01 Aug - 08 Aug	Air France
02 Aug - 12 Aug	Vueling Airlines
01 Aug - 17 Aug	Vueling Airlines
04 Aug - 14 Aug	Transavia France
04 Aug - 05 Sep	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.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Lisbon to Sydney in August from $1226

Return flights