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

Return flights

05 Aug - 31 Aug	Air China
05 Aug - 22 Aug	Air China
05 Aug - 24 Aug	Air China
03 Aug - 31 Aug	Air China
05 Aug - 26 Aug	Air China
07 Aug - 09 Sep	Air China
03 Aug - 02 Sep	Air China
13 Aug - 20 Aug	China Eastern
08 Aug - 22 Aug	China Eastern
13 Aug - 31 Aug	Air China
13 Aug - 29 Aug	Air China
15 Aug - 09 Sep	Air China
14 Aug - 28 Aug	Air China
13 Aug - 02 Sep	Air China
17 Aug - 07 Sep	Air China
15 Aug - 05 Sep	Air China
01 Aug - 07 Sep	China Eastern
12 Aug - 08 Sep	China Eastern
04 Aug - 04 Sep	Air China
12 Aug - 09 Sep	Air China

Also check the deals for one-way flights from Sydney to London in August.

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 August from $842

Return flights