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

Return flights

06 Dec - 21 Jan	ANA
08 Dec - 21 Jan	ANA
06 Dec - 27 Dec	Air China
12 Dec - 27 Dec	Air China
01 Dec - 05 Dec	Air China
09 Dec - 07 Jan	Air China
18 Dec - 08 Jan	Air China
16 Dec - 26 Dec	Air China
18 Dec - 28 Jan	ANA
05 Dec - 10 Dec	Asiana Airlines
03 Dec - 10 Dec	Asiana Airlines
14 Dec - 27 Dec	Air China
02 Dec - 23 Dec	Air China
09 Dec - 15 Dec	Air China
09 Dec - 16 Dec	Air China
19 Dec - 26 Jan	ANA
20 Dec - 05 Jan	Air China
30 Dec - 06 Jan	Air China
30 Dec - 07 Jan	Air China
22 Dec - 06 Jan	Air China

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

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 December from $668

Return flights