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

Return flights

01 Dec - 31 Jan	Etihad Airways
01 Dec - 10 Dec	Etihad Airways
02 Dec - 04 Dec	Scoot
02 Dec - 09 Dec	Jetstar
03 Dec - 10 Dec	Jetstar
01 Dec - 06 Dec	Scoot
04 Dec - 11 Dec	Scoot
13 Dec - 26 Dec	Batik Air Malaysia
31 Dec - 06 Jan	Air China
05 Dec - 14 Dec	Jetstar
06 Dec - 08 Dec	Jetstar
31 Dec - 20 Jan	Air China
31 Dec - 07 Jan	Air China
06 Dec - 13 Dec	Jetstar
01 Dec - 05 Jan	Lufthansa
30 Dec - 26 Jan	Turkish Airlines
31 Dec - 19 Jan	Air China
31 Dec - 17 Jan	Air China
30 Dec - 20 Jan	Air China
28 Dec - 04 Jan	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 838€

Return flights