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

Return flights

03 Dec - 28 Jan	Air China
05 Dec - 28 Jan	Air China
05 Dec - 25 Jan	Air China
01 Dec - 28 Jan	Air China
05 Dec - 21 Jan	Air China
01 Dec - 26 Jan	Air China
01 Dec - 29 Jan	Air China
02 Dec - 14 Jan	Air China
01 Dec - 15 Jan	Air China
01 Dec - 31 Jan	Air China
03 Dec - 16 Dec	Hainan Airlines
01 Dec - 09 Dec	China Southern
03 Dec - 10 Dec	China Southern
03 Dec - 25 Dec	China Southern
02 Dec - 25 Dec	China Southern
08 Dec - 23 Dec	Hainan Airlines
05 Dec - 16 Dec	Hainan Airlines
08 Dec - 16 Dec	Hainan Airlines
07 Dec - 16 Dec	Hainan Airlines
03 Dec - 09 Dec	Hainan 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 541€

Return flights