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

Return flights

01 Dec - 05 Dec	Ryanair
01 Dec - 08 Dec	British Airways
01 Dec - 07 Dec	British Airways
02 Dec - 16 Jan	British Airways
02 Dec - 31 Jan	British Airways
26 Dec - 02 Jan	Transavia France
09 Dec - 23 Dec	British Airways
22 Dec - 31 Dec	Turkish Airlines
06 Dec - 27 Dec	British Airways
25 Dec - 15 Jan	British Airways
16 Dec - 29 Dec	British Airways
16 Dec - 07 Jan	British Airways
26 Dec - 30 Jan	British Airways
10 Dec - 20 Jan	British Airways
20 Dec - 20 Jan	Turkish Airlines
16 Dec - 08 Jan	Turkish Airlines
27 Dec - 17 Jan	Turkish Airlines
01 Dec - 15 Dec	British Airways

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

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 December from 1060€

Return flights