AirHint found the following cheapest one-way flights from Seoul (ICN) to Bangkok (BKK) in September 2025 (see full year).

One-Way flights

24 Sep	T'way Air	direct
21 Sep	T'way Air	direct
22 Sep	Eastar Jet	direct
20 Sep	T'way Air	direct
19 Sep	Thai AirAsia X	direct
27 Sep	Jeju Air	direct
23 Sep	Air Busan	direct
28 Sep	Vietnam Airlines
25 Sep	Jeju Air	direct
26 Sep	Thai AirAsia X	direct

Also check the deals for return flights from Seoul to Bangkok 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 one-way flights from Seoul to Bangkok in September from $62

One-Way flights