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

Return flights

09 Sep - 10 Sep	Jeju Air
09 Sep - 11 Sep	T'way Air
09 Sep - 16 Sep	T'way Air
17 Sep - 24 Sep	Jin Air
10 Sep - 11 Sep	Eastar Jet
10 Sep - 17 Sep	Eastar Jet
16 Sep - 17 Sep	Jin Air
23 Sep - 24 Sep	Eastar Jet
08 Sep - 10 Sep	T'way Air
10 Sep - 14 Sep	Eastar Jet
28 Sep - 27 Oct	T'way Air
28 Sep - 01 Oct	T'way Air
29 Sep - 02 Oct	T'way Air
25 Sep - 02 Oct	T'way Air
29 Sep - 12 Oct	Eastar Jet
30 Sep - 04 Oct	T'way Air
29 Sep - 06 Oct	T'way Air
28 Sep - 05 Oct	T'way Air
27 Sep - 04 Oct	T'way Air
26 Sep - 03 Oct	Eastar Jet

Also check the deals for one-way flights from Seoul to Busan 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 Seoul to Busan in September from 138€

Return flights