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

Return flights

26 Dec - 29 Dec	Air China
29 Dec - 12 Jan	AirAsia X
30 Dec - 13 Jan	Air China
27 Dec - 14 Jan	Air China
26 Dec - 31 Jan	Air China
26 Dec - 13 Jan	Air China
27 Dec - 17 Jan	Jetstar
27 Dec - 31 Dec	Jetstar
26 Dec - 12 Jan	Air China
28 Dec - 12 Jan	Virgin Australia
29 Dec - 11 Jan	Air China
27 Dec - 01 Jan	Air China
26 Dec - 30 Dec	Cathay Pacific
28 Dec - 28 Dec	Emirates
26 Dec - 26 Dec	Qantas

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 1123€

Return flights