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

One-Way flights

05 Sep	Thai AirAsia X	direct
04 Sep	T'way Air	direct
08 Sep	Thai AirAsia X	direct
20 Sep	T'way Air	direct
09 Sep	T'way Air	direct
21 Sep	T'way Air	direct
22 Sep	T'way Air	direct
02 Sep	T'way Air	direct
26 Sep	Thai AirAsia X	direct
12 Sep	Vietnam Airlines

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 $70

One-Way flights