Yes, there are multiple flights from Thailand to Montevideo for under ฿ 51,032. The cheapest flight booked recently is on Emirates for just ฿ 49,741, but on average you can expect to pay ฿ 61,839.
There are no direct flights from Thailand to Montevideo, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
Emirates and Qatar Airways can get you from Thailand to Montevideo in just under 32h 20m. Your travel time can differ by up to 55m. Both multi-stop and direct flights can be found to your destination and back.
Cheapflights users have booked flights from Thailand to Montevideo from ฿ 49,742 return. Another airline that can offer you cheap pricing is Qatar Airways.