Yes, there are multiple flights from Chiang Mai to Serbia for under ฿ 36,022. The cheapest flight booked recently is on Emirates for just ฿ 35,302, but on average you can expect to pay ฿ 35,962.
There are no direct flights from Chiang Mai to Serbia, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
Departing from Chiang Mai to Serbia will take you 22h 55m.
Flying on Emirates is currently your cheapest option to Serbia, with prices starting at ฿ 35,302.