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

Return flights

08 Sep - 11 Sep	Air China
03 Sep - 09 Sep	Air China
06 Sep - 09 Sep	Air China
01 Sep - 16 Sep	Air China
01 Sep - 09 Sep	Air China
05 Sep - 14 Sep	China Eastern
17 Sep - 23 Sep	Air China
01 Sep - 06 Sep	Air China
12 Sep - 20 Sep	Air China
01 Sep - 05 Sep	ANA
28 Sep - 26 Oct	ANA
13 Sep - 14 Oct	Air China
22 Sep - 05 Oct	ANA
29 Sep - 05 Oct	ANA
26 Sep - 05 Oct	ANA
01 Sep - 02 Oct	Asiana Airlines
29 Sep - 13 Oct	ANA
23 Sep - 03 Oct	ANA
25 Sep - 15 Oct	ANA
26 Sep - 03 Oct	ANA

Also check the deals for one-way flights from Seoul to Sydney in September.

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 September from $571

Return flights