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

Return flights

03 Aug - 24 Aug	Air China
07 Aug - 31 Aug	Air China
03 Aug - 31 Aug	Air China
03 Aug - 29 Aug	Air China
05 Aug - 24 Aug	Air China
07 Aug - 22 Aug	Air China
01 Aug - 23 Aug	China Eastern
11 Aug - 08 Sep	China Eastern
01 Aug - 14 Aug	China Eastern
01 Aug - 22 Aug	China Eastern
06 Aug - 18 Aug	China Eastern
03 Aug - 02 Sep	Air China
04 Aug - 02 Sep	China Eastern
07 Aug - 09 Sep	Air China
05 Aug - 07 Sep	Air China
01 Aug - 07 Sep	China Eastern
05 Aug - 16 Sep	Air China
09 Aug - 05 Sep	Air China
11 Aug - 07 Sep	Air China
09 Aug - 12 Sep	China Eastern

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 716€

Return flights