Yes, there are multiple flights from Thailand to Asahikawa for under ฿ 20,953. The cheapest flight booked recently is on ANA for just ฿ 19,067, but on average you can expect to pay ฿ 20,354.
There are no direct flights from Thailand to Asahikawa, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as ฿ 21,492, ANA can have you in Asahikawa from Thailand in 19h. This flight may include one or multiple stops.
ANA, at ฿ 19,068, was found to be the cheapest airline from Thailand to Asahikawa. An alternate airline flying to your destination would be Cathay Pacific.