I want to fly to Khon Kaen this week,I thought there was a Airport,but looking up AirAsia and NokAir ,I cant seem to find Khon Kaen Airport listed,can someone help?

Im travelling from Bangkok.

Thanks to you if you can help me.

Thai Air are the only airline that fly to Khon Kaen.

http://www.thaiair.com/index.html

Only Thai air flys there. I think Airasia did but they don't anymore.

Only Thai air flys there. I think Airasia did but they don't anymore.

That is correct. If you are going from BKK to Khon Kaen there isn't any other option. If your eventual destination is another town in central or upper Isaan you might consider Air Asia to Udon or PB Air to Roi Et.