Yes, there are multiple flights from Thailand to Klagenfurt for under ฿ 74,831. The cheapest flight booked recently is on Austrian Airlines for just ฿ 72,227, but on average you can expect to pay ฿ 74,891.
There are no direct flights from Thailand to Klagenfurt, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
Austrian Airlines and Lufthansa can get you from Thailand to Klagenfurt in just under 15h 55m. Your travel time can differ by up to 45m. This flight may include one or multiple stops.
Cheapflights users have booked flights from Thailand to Klagenfurt from ฿ 72,228 return. Another airline that can offer you cheap pricing is Lufthansa.