Yes, there are multiple flights from Thailand to Spokane for under ฿ 29,933. The cheapest flight booked recently is on Multiple Airlines for just ฿ 28,765, but on average you can expect to pay ฿ 57,920.
There are no direct flights from Thailand to Spokane, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
Airlines like United Airlines and KLM fly from Thailand to Spokane in about 21h 49m. The time it takes to get you to your destination can typically vary by up to 6h 34m. This flight may include one or multiple stops.
Currently priced at ฿ 35,650, United Airlines will fly you from Thailand to Spokane and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on KLM for as low as ฿ 50,766.
฿ 25,353 is the cheapest one-way deal found within the past few days, from Korean Air.