Yes, there are multiple flights from Bangkok Intl to Kumamoto for under ฿ 20,953. The cheapest flight booked recently is on ANA for just ฿ 20,115, but on average you can expect to pay ฿ 20,115.
There are no direct flights from Bangkok Intl to Kumamoto, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as ฿ 20,115, ANA can have you in Kumamoto from Bangkok Intl in 10h 50m.
According to our current data, ANA (฿ 20,115), offers the cheapest pricing from Bangkok Intl to Kumamoto.