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	Batik Air Malaysia
04 Dec - 01 Jan	Batik Air Malaysia
04 Dec - 15 Jan	China Eastern
04 Dec - 18 Dec	Batik Air Malaysia
14 Dec - 28 Dec	Batik Air Malaysia
06 Dec - 25 Dec	China Eastern
06 Dec - 19 Jan	China Eastern
11 Dec - 18 Dec	Scoot
03 Dec - 18 Dec	Scoot
09 Dec - 19 Jan	Garuda Indonesia
05 Dec - 07 Jan	China Eastern
04 Dec - 02 Jan	China Eastern
11 Dec - 27 Dec	Jetstar
02 Dec - 17 Dec	Scoot
22 Dec - 28 Dec	Scoot
01 Dec - 09 Jan	China Eastern
31 Dec - 23 Jan	China Eastern
02 Dec - 15 Dec	Emirates
02 Dec - 23 Dec	Emirates
07 Dec - 18 Jan	Garuda Indonesia

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Sydney to London in December from 1093€

Return flights