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

Return flights

31 Dec - 02 Jan	Scoot
31 Dec - 23 Jan	Air China
26 Dec - 21 Jan	AirAsia X
29 Dec - 06 Jan	China Eastern
29 Dec - 05 Jan	AirAsia X
26 Dec - 09 Jan	AirAsia X
27 Dec - 11 Jan	AirAsia X
31 Dec - 21 Jan	Air China
26 Dec - 29 Dec	AirAsia X
28 Dec - 11 Jan	Jetstar
30 Dec - 20 Jan	AirAsia X
28 Dec - 30 Dec	AirAsia X
24 Dec - 31 Dec	Virgin Australia
27 Dec - 28 Dec	AirAsia X
26 Dec - 28 Dec	Jetstar
23 Dec - 30 Dec	Jetstar
24 Dec - 27 Dec	Thai Airways
23 Dec - 27 Dec	AirAsia X
25 Dec - 31 Dec	Virgin Australia
23 Dec - 24 Dec	Jetstar

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 $1324

Return flights