Yes, there are multiple flights from Bangkok to Afghanistan for under ฿ 14,966. The cheapest flight booked recently is on Multiple Airlines for just ฿ 14,966, but on average you can expect to pay ฿ 25,772.
There are no direct flights from Bangkok to Afghanistan, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
There are currently 12+ open flights from Bangkok to Afghanistan within the next 7 days for less than ฿ 14,966.
For as low as ฿ 40,110, Emirates can have you in Afghanistan from Bangkok in 18h 15m.
Currently priced at ฿ 40,110, Emirates will fly you from Bangkok to Afghanistan and back. In addition to Emirates, many other airlines offer competitively priced options for your trip.