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

Return flights

01 Dec - 06 Dec	Jetstar
01 Dec - 11 Dec	Jetstar
03 Dec - 06 Dec	Jetstar
02 Dec - 11 Dec	Jetstar
01 Dec - 08 Dec	Jetstar
03 Dec - 08 Dec	Jetstar
02 Dec - 08 Dec	Jetstar
04 Dec - 07 Dec	Jetstar
01 Dec - 07 Dec	Garuda Indonesia
03 Dec - 10 Dec	Jetstar
02 Dec - 17 Jan	Garuda Indonesia
15 Dec - 15 Jan	Garuda Indonesia
04 Dec - 27 Jan	Jetstar
02 Dec - 27 Jan	China Airlines
02 Dec - 04 Jan	China Airlines
02 Dec - 20 Jan	China Airlines
04 Dec - 03 Jan	Jetstar	direct
04 Dec - 02 Jan	Jetstar	direct
04 Dec - 26 Jan	Jetstar	direct
01 Dec - 02 Jan	Jetstar	direct

Also check the deals for one-way flights from Sydney to Seoul 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 Sydney to Seoul in December from $542

Return flights