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

Return flights

21 Oct - 23 Oct	Eastar Jet
16 Oct - 22 Oct	T'way Air
13 Oct - 15 Oct	Jeju Air
15 Oct - 28 Oct	Jeju Air
20 Oct - 22 Oct	Eastar Jet
28 Oct - 30 Oct	Jeju Air
15 Oct - 18 Oct	Eastar Jet
22 Oct - 29 Oct	Air Busan
22 Oct - 24 Oct	Jeju Air
22 Oct - 25 Oct	T'way Air
25 Oct - 01 Nov	T'way Air
31 Oct - 04 Nov	T'way Air
30 Oct - 02 Nov	Jeju Air
26 Oct - 02 Nov	T'way Air
31 Oct - 02 Nov	T'way Air

Also check the deals for one-way flights from Seoul to Busan in October.

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 October from 186€

Return flights