Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Nur-Sultan as you normally would.
Nur-Sultan Nursultan Nazarbayev Intl (NQZ) is the airport you will fly into if you book a flight from Bangkok to Nur-Sultan. You should not have trouble finding flights to Nursultan Nazarbayev Intl from Bangkok; the airport handles an average of 0 inbound flights from Bangkok per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Nur-Sultan airport from Bangkok. It is only a 14.2 km journey from Nursultan Nazarbayev Intl (NQZ) to Nur-Sultan’s city centre.
Yes, there are multiple flights from Bangkok to Nur-Sultan for under ฿34,300. The cheapest flight booked recently is on Multiple Airlines for just ฿34,258, but on average you can expect to pay ฿46,867.
The cheapest airlines for a one-way flight from Bangkok to Nur-Sultan are เตอร์กิชแอร์ไลน์ (฿34,024), แอร์แอสทาน่า (฿35,392), and Emirates (฿36,960).