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

Return flights

29 Oct - 06 Nov	Air China
20 Oct - 26 Oct	ANA
21 Oct - 26 Oct	ANA
21 Oct - 29 Oct	ANA
20 Oct - 29 Oct	ANA
21 Oct - 28 Oct	ANA
20 Oct - 28 Oct	ANA
21 Oct - 01 Nov	ANA
21 Oct - 27 Oct	ANA
20 Oct - 27 Oct	ANA
22 Oct - 25 Oct	Air China
17 Oct - 25 Oct	Air China
10 Oct - 06 Nov	Air China
30 Oct - 01 Nov	Asiana Airlines
23 Oct - 01 Nov	ANA
31 Oct - 02 Nov	Air China
22 Oct - 12 Nov	Asiana Airlines
19 Oct - 03 Nov	ANA
28 Oct - 02 Nov	Asiana Airlines
30 Oct - 04 Nov	Asiana Airlines

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

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 October from 503€

Return flights