Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Bangkok to Afghanistan as you normally would.
Related info for your journey
Useful info, stats and facts about Bangkok to Afghanistan flights.
This is defined as Bangkok Suvarnabhumi Airport (BKK) and Kabul Khwaja Rawash Airport (KBL). Codes like Kabul Khwaja Rawash Airport are often used to just call airports uniquely. This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Mazar-I-Sharif Airport (MZR), Kandahar Airport (KDH), Herat Airport (HEA), Jalalabad Airport (JAA), Bamiyan Airport (BIN).