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

Return flights

04 Dec - 28 Jan	Turkish Airlines
04 Dec - 07 Dec	Scoot Tigerair
04 Dec - 11 Dec	Scoot Tigerair
02 Dec - 09 Dec	Scoot Tigerair
04 Dec - 14 Dec	Scoot Tigerair
05 Dec - 07 Dec	VietJet Air
02 Dec - 12 Dec	Scoot Tigerair
03 Dec - 07 Jan	Turkish Airlines
02 Dec - 13 Dec	Turkish Airlines
11 Dec - 28 Dec	Batik Air Malaysia
07 Dec - 29 Dec	Scoot Tigerair
03 Dec - 09 Jan	Turkish Airlines
01 Dec - 14 Jan	China Eastern
12 Dec - 09 Jan	VietJet Air
03 Dec - 28 Dec	Turkish Airlines
07 Dec - 01 Jan	Scoot Tigerair
01 Dec - 03 Jan	China Eastern
30 Dec - 24 Jan	China Eastern
11 Dec - 29 Jan	Batik Air Malaysia
04 Dec - 08 Jan	Batik Air Malaysia

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 787€

Return flights