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

Return flights

21 Sep - 22 Sep	Scoot
17 Sep - 21 Sep	VietJet Air
21 Sep - 24 Sep	Scoot
17 Sep - 24 Sep	VietJet Air
17 Sep - 22 Sep	VietJet Air
22 Sep - 28 Oct	Cebu Pacific
15 Sep - 20 Sep	Xiamen Airlines
22 Sep - 23 Oct	Cebu Pacific
18 Sep - 21 Sep	Xiamen Airlines
23 Sep - 20 Oct	Scoot
16 Sep - 21 Sep	Cebu Pacific
16 Sep - 24 Sep	Cebu Pacific
16 Sep - 25 Sep	VietJet Air
16 Sep - 28 Oct	Cebu Pacific
22 Sep - 15 Oct	Cebu Pacific
30 Sep - 20 Oct	T'way Air	direct
30 Sep - 15 Oct	T'way Air	direct
23 Sep - 28 Oct	Scoot
22 Sep - 24 Oct	Cebu Pacific
22 Sep - 18 Oct	Scoot

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 410€

Return flights