For a flight from Thailand to Seville, you will be flying into Sevilla. Seville (SVQ) is just 8.9 km from the center of the city.
Yes, there are multiple flights from Thailand to Seville for under ฿21,891. The cheapest flight booked recently is on KLM for just ฿21,203, but on average you can expect to pay ฿25,957.
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 ฿21,204, KLM can have you in Seville from Thailand in 26h 30m. Both multi-stop and direct flights can be found to your destination and back.
Cheapflights users have booked flights from Thailand to Seville from ฿21,204 return. Another airline that can offer you cheap pricing is Air France.