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

Return flights

05 Sep - 08 Sep	China Eastern
03 Sep - 13 Sep	Air Busan
01 Sep - 10 Sep	ANA
04 Sep - 10 Sep	ANA
05 Sep - 10 Sep	ANA
05 Sep - 09 Sep	ANA
06 Sep - 08 Sep	ANA
02 Sep - 04 Sep	ANA
04 Sep - 08 Sep	ANA
03 Sep - 10 Sep	ANA
18 Sep - 22 Oct	ANA
24 Sep - 19 Oct	ANA
23 Sep - 19 Oct	ANA
16 Sep - 19 Oct	ANA
29 Sep - 15 Oct	ANA
23 Sep - 02 Oct	ANA
28 Sep - 03 Oct	ANA
21 Sep - 03 Oct	ANA
28 Sep - 13 Oct	ANA
19 Sep - 02 Oct	ANA

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 437€

Return flights