Yes, there are multiple flights from Thailand to Obihiro for under ฿ 20,975. The cheapest flight booked recently is on ANA for just ฿ 19,088, but on average you can expect to pay ฿ 39,883.
There are no direct flights from Thailand to Obihiro, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as ฿ 59,241, ANA can have you in Obihiro from Thailand in 14h 05m.
Cheapflights users have booked flights from Thailand to Obihiro from ฿ 19,088 return.