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

Return flights

16 Dec - 31 Jan	AirAsia X
14 Dec - 21 Dec	AirAsia X
11 Dec - 26 Jan	Batik Air Malaysia
11 Dec - 16 Dec	Batik Air Malaysia
11 Dec - 17 Dec	Batik Air Malaysia
16 Dec - 21 Jan	AirAsia X
11 Dec - 21 Jan	Batik Air Malaysia
28 Dec - 24 Jan	AirAsia X
17 Dec - 30 Jan	AirAsia X
14 Dec - 16 Dec	AirAsia X
15 Dec - 22 Dec	AirAsia X
28 Dec - 11 Jan	AirAsia X
25 Dec - 18 Jan	AirAsia X
11 Dec - 14 Jan	Batik Air Malaysia
15 Dec - 11 Jan	AirAsia X
12 Dec - 29 Dec	Scoot
11 Dec - 30 Dec	Batik Air Malaysia
23 Dec - 30 Dec	AirAsia X
12 Dec - 18 Dec	Scoot
14 Dec - 28 Dec	AirAsia X

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 $1194

Return flights