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

Return flights

30 Aug - 06 Sep	VietJet Air
30 Aug - 01 Sep	VietJet Air
30 Aug - 14 Sep	VietJet Air
30 Aug - 18 Sep	Cebu Pacific
30 Aug - 03 Sep	Scoot
31 Aug - 18 Sep	Cebu Pacific
30 Aug - 05 Sep	Cebu Pacific
31 Aug - 10 Sep	Cebu Pacific
31 Aug - 16 Sep	Cebu Pacific
30 Aug - 04 Sep	Cebu Pacific
30 Aug - 31 Aug	Cebu Pacific
30 Aug - 31 Aug	Jetstar	direct

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

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 August from $592

Return flights