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

Return flights

04 Dec - 28 Jan	China Southern
08 Dec - 15 Jan	Ryanair
27 Dec - 18 Jan	China Eastern
28 Dec - 18 Jan	China Eastern
29 Dec - 19 Jan	China Eastern
28 Dec - 19 Jan	China Eastern
01 Dec - 25 Dec	Air China
12 Dec - 15 Jan	easyJet
29 Dec - 29 Jan	easyJet
07 Dec - 25 Jan	China Southern
28 Dec - 17 Jan	China Southern
02 Dec - 10 Dec	China Southern
01 Dec - 11 Dec	China Southern
01 Dec - 10 Dec	China Southern
01 Dec - 04 Dec	Ryanair
01 Dec - 15 Dec	China Southern
01 Dec - 26 Dec	China Airlines
01 Dec - 23 Dec	Air China
04 Dec - 11 Dec	China Southern
01 Dec - 22 Dec	China Southern

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 $871

Return flights