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

Return flights

28 Sep - 30 Oct	Jetstar	direct
08 Sep - 22 Sep	Scoot
08 Sep - 13 Sep	Scoot
16 Sep - 17 Sep	Scoot
15 Sep - 22 Sep	Scoot
10 Sep - 17 Sep	Scoot
08 Sep - 15 Sep	Scoot
07 Sep - 13 Sep	AirAsia X
06 Sep - 13 Sep	AirAsia X
02 Sep - 09 Sep	AirAsia X
06 Sep - 12 Sep	AirAsia X
18 Sep - 28 Oct	Jetstar	direct
30 Sep - 21 Oct	Hong Kong Airlines
28 Sep - 12 Oct	Jetstar	direct
16 Sep - 15 Oct	Scoot
26 Sep - 19 Oct	Jetstar
26 Sep - 14 Oct	Jetstar
16 Sep - 14 Oct	Scoot
28 Sep - 17 Oct	Jetstar
30 Sep - 20 Oct	Jetstar	direct

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

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 September from $394

Return flights