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

Return flights

05 Dec - 10 Dec	Air China
17 Dec - 21 Jan	ANA
14 Dec - 30 Dec	Air China
01 Dec - 06 Dec	Air China
01 Dec - 05 Dec	Air China
02 Dec - 06 Dec	Air China
17 Dec - 30 Dec	Air China
04 Dec - 10 Dec	Asiana Airlines
02 Dec - 09 Dec	Air China
15 Dec - 18 Dec	Air China
15 Dec - 19 Dec	Air China
23 Dec - 07 Jan	Air China
23 Dec - 06 Jan	Air China
23 Dec - 08 Jan	Air China
26 Dec - 01 Jan	Air China
22 Dec - 02 Jan	Air China
26 Dec - 04 Jan	Air China
19 Dec - 01 Jan	Air China
25 Dec - 04 Jan	Air China
24 Dec - 22 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 503€

Return flights