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

Return flights

05 Aug - 19 Aug	Air China
08 Aug - 22 Aug	Air China
01 Aug - 22 Aug	Air China
08 Aug - 17 Aug	Air China
03 Aug - 22 Aug	Air China
12 Aug - 09 Sep	Turkish Airlines
26 Aug - 06 Sep	Etihad Airways
04 Aug - 24 Aug	Scoot Tigerair
19 Aug - 09 Sep	Turkish Airlines
08 Aug - 20 Aug	Turkish Airlines
05 Aug - 26 Aug	Turkish Airlines
05 Aug - 21 Aug	Turkish Airlines
08 Aug - 25 Aug	Air China
24 Aug - 08 Sep	Air India
26 Aug - 16 Sep	Turkish Airlines
28 Aug - 19 Sep	China Eastern
26 Aug - 13 Sep	Turkish Airlines
01 Aug - 27 Sep	Turkish Airlines
26 Aug - 23 Sep	Air Canada
23 Aug - 13 Sep	Emirates

Also check the deals for one-way flights from Sydney to Lisbon 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 Sydney to Lisbon in August from $1071

Return flights