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

Return flights

18 Aug - 26 Aug	T'way Air
20 Aug - 25 Aug	China Eastern
12 Aug - 17 Aug	T'way Air
24 Aug - 27 Aug	Jeju Air
11 Aug - 18 Aug	China Eastern
12 Aug - 22 Aug	China Eastern
23 Aug - 31 Aug	China Eastern
29 Aug - 31 Aug	ANA
30 Aug - 31 Aug	ANA
23 Aug - 26 Aug	ANA
21 Aug - 02 Sep	ANA
30 Aug - 09 Sep	ANA
31 Aug - 05 Sep	ANA
28 Aug - 02 Sep	ANA
30 Aug - 04 Sep	ANA
29 Aug - 08 Sep	ANA
27 Aug - 02 Sep	ANA
27 Aug - 04 Sep	ANA
30 Aug - 05 Sep	ANA
27 Aug - 09 Sep	ANA

Also check the deals for one-way flights from Seoul to Sydney 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 Seoul to Sydney in August from $491

Return flights