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

Return flights

01 Sep - 16 Sep	Cebu Pacific
05 Sep - 09 Sep	AirAsia X
05 Sep - 11 Sep	AirAsia X
01 Sep - 26 Oct	Jetstar	direct
01 Sep - 05 Sep	AirAsia X
02 Sep - 09 Sep	AirAsia X
01 Sep - 09 Sep	AirAsia X
06 Sep - 10 Sep	China Eastern
03 Sep - 09 Sep	Scoot Tigerair
01 Sep - 08 Sep	Scoot Tigerair
09 Sep - 15 Sep	China Southern
01 Sep - 27 Oct	Jetstar	direct
01 Sep - 31 Oct	Jetstar	direct
17 Sep - 02 Oct	Jetstar	direct
05 Sep - 13 Oct	AirAsia X
16 Sep - 16 Oct	Jetstar	direct
21 Sep - 02 Oct	Cebu Pacific
23 Sep - 05 Oct	AirAsia X
12 Sep - 02 Oct	Cebu Pacific
22 Sep - 02 Oct	Cebu Pacific

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

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Cheapest return flights from Seoul to Sydney in September from 327€

Return flights