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

Return flights

03 Dec - 13 Jan	China Eastern
01 Dec - 31 Jan	China Eastern
02 Dec - 18 Jan	China Eastern
29 Dec - 20 Jan	China Eastern
11 Dec - 22 Jan	easyJet
02 Dec - 14 Jan	China Eastern
05 Dec - 15 Jan	China Eastern
30 Dec - 14 Jan	China Eastern
30 Dec - 30 Jan	China Eastern
30 Dec - 12 Jan	China Eastern
02 Dec - 09 Dec	China Southern
05 Dec - 15 Dec	Air China
05 Dec - 24 Dec	Air China
04 Dec - 11 Dec	Wizz Air UK
03 Dec - 10 Dec	Vueling Airlines
01 Dec - 07 Dec	easyJet
02 Dec - 06 Dec	China Eastern
02 Dec - 30 Dec	China Eastern
03 Dec - 28 Dec	China Eastern
05 Dec - 14 Dec	China Eastern

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 $795

Return flights