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

Return flights

11 Dec - 20 Jan	Air China
11 Dec - 12 Dec	Air China
11 Dec - 14 Dec	Air China
09 Dec - 16 Dec	Air China
08 Dec - 11 Dec	Air China
15 Dec - 15 Jan	Air China
15 Dec - 16 Jan	Air China
11 Dec - 15 Dec	Air China
17 Dec - 30 Dec	Air China
18 Dec - 28 Dec	Air China
06 Dec - 13 Dec	T'way Air
08 Dec - 16 Dec	Air China
08 Dec - 12 Dec	Air China
26 Dec - 14 Jan	Air China
26 Dec - 13 Jan	Air China
29 Dec - 12 Jan	Shanghai Airlines
31 Dec - 14 Jan	Air China
29 Dec - 20 Jan	Air China
30 Dec - 12 Jan	Air China
30 Dec - 14 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 473€

Return flights