Yes, there are multiple flights from Thailand to Seville for under ฿ 23,956. The cheapest flight booked recently is on Lufthansa for just ฿ 21,351, but on average you can expect to pay ฿ 32,580.
There are no direct flights from Thailand to Seville, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as ฿ 23,358, Lufthansa can have you in Seville from Thailand in 17h 40m. Both multi-stop and direct flights can be found to your destination and back.
Cheapflights users have booked flights from Thailand to Seville from ฿ 21,351 return. Another airline that can offer you cheap pricing is Qatar Airways.