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

Return flights

04 Dec - 11 Dec	Scoot Tigerair
04 Dec - 04 Jan	Scoot Tigerair
11 Dec - 29 Dec	Scoot Tigerair
03 Dec - 10 Dec	Turkish Airlines
03 Dec - 02 Jan	Turkish Airlines
11 Dec - 28 Dec	Scoot Tigerair
03 Dec - 15 Jan	Turkish Airlines
02 Dec - 01 Jan	Turkish Airlines
02 Dec - 04 Jan	Turkish Airlines
14 Dec - 04 Jan	Scoot Tigerair
17 Dec - 29 Dec	Scoot Tigerair
14 Dec - 11 Jan	Scoot Tigerair
26 Dec - 02 Jan	Air China
28 Dec - 04 Jan	Scoot Tigerair
25 Dec - 28 Jan	Turkish Airlines
01 Dec - 29 Dec	Qatar Airways
02 Dec - 05 Dec	Singapore Airlines
12 Dec - 26 Dec	Air China
09 Dec - 30 Dec	Qatar Airways
15 Dec - 21 Dec	Air China

Also check the deals for one-way flights from Sydney to London 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 Sydney to London in December from $918

Return flights