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

Return flights

26 Dec - 18 Jan	China Eastern
27 Dec - 18 Jan	China Eastern
28 Dec - 18 Jan	China Eastern
29 Dec - 18 Jan	China Eastern
28 Dec - 19 Jan	China Eastern
29 Dec - 19 Jan	China Eastern
29 Dec - 20 Jan	China Eastern
31 Dec - 21 Jan	Air China
15 Dec - 15 Jan	easyJet
12 Dec - 18 Jan	easyJet
07 Dec - 11 Dec	Wizz Air UK
03 Dec - 27 Dec	China Eastern
02 Dec - 27 Dec	China Eastern
03 Dec - 14 Dec	Wizz Air UK
02 Dec - 24 Dec	Turkish Airlines
02 Dec - 22 Dec	Turkish Airlines
01 Dec - 25 Dec	Turkish Airlines
03 Dec - 23 Dec	Turkish Airlines
03 Dec - 25 Dec	Turkish Airlines
02 Dec - 23 Dec	Turkish Airlines

Also check the deals for one-way flights from London 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 London to Sydney in December from $971

Return flights