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

Return flights

29 Dec - 10 Jan	T'way Air
31 Dec - 09 Jan	Air China
31 Dec - 07 Jan	Air China
31 Dec - 02 Jan	Air China
27 Dec - 24 Jan	Asiana Airlines
30 Dec - 06 Jan	Air Busan
27 Dec - 17 Jan	Asiana Airlines
29 Dec - 27 Jan	Asiana Airlines
29 Dec - 31 Dec	Asiana Airlines
27 Dec - 31 Dec	Asiana Airlines
29 Dec - 11 Jan	Asiana Airlines
28 Dec - 31 Dec	Asiana Airlines
27 Dec - 30 Dec	Asiana Airlines
29 Dec - 01 Jan	Asiana Airlines
27 Dec - 28 Dec	Japan Airlines

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 718€

Return flights