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

One-Way flights

01 Sep	T'way Air	direct
08 Sep	T'way Air	direct
25 Sep	Thai AirAsia X	direct
23 Sep	Thai AirAsia X	direct
30 Sep	Thai AirAsia X	direct
13 Sep	Vietnam Airlines
22 Sep	Vietnam Airlines
10 Sep	Vietnam Airlines
06 Sep	Vietnam Airlines
06 Sep	Air Busan	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 $60

One-Way flights