Yes, there are multiple flights from Bangkok Intl to Astana for under ฿ 33,021. The cheapest flight booked recently is on Turkish Airlines for just ฿ 30,319, but on average you can expect to pay ฿ 40,796.
There are no direct flights from Bangkok Intl to Astana, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
We forecast the temperature to be around the 36 °Cs in April, on average. The temperature in Astana is generally colder than in Bangkok Intl. Book flights in a timely manner in correlation to your departure date.
For as low as ฿ 30,320, Turkish Airlines can have you in Astana from Bangkok Intl in 18h 25m. This flight may include one or multiple stops.
Flying on Turkish Airlines is currently your cheapest option to Astana, with prices starting at ฿ 30,320. Another option worth looking into is Aeroflot, starting at ฿ 45,960 return.